28 changed files with 1484 additions and 2 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
--- a/.mvn/wrapper/maven-wrapper.jar
+++ b/.mvn/wrapper/maven-wrapper.jar
--- a/.mvn/wrapper/maven-wrapper.properties
+++ b/.mvn/wrapper/maven-wrapper.properties
@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar
--- a/15
+++ b/15
@ -0,0 +1,15 @@
+FROM maven:3.6.3-openjdk-17-slim as BUILDER
+ARG VERSION=0.0.1-SNAPSHOT
+WORKDIR /build/
+COPY pom.xml /build/
+COPY src /build/src
+
+RUN mvn clean install
+COPY target/mailsender-${VERSION}.jar target/application.jar
+
+FROM java:21.0.2-jre-slim
+WORKDIR /app/
+
+COPY --from=BUILDER /build/target/application.jar /app/
+CMD java -jar /app/application.jar
+
--- a/README.md
+++ b/README.md
@ -1,2 +0,0 @@
-# Email_Service
-
--- a/308
+++ b/308
@ -0,0 +1,308 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.2.0
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "$(uname)" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        JAVA_HOME="$(/usr/libexec/java_home)"; export JAVA_HOME
+      else
+        JAVA_HOME="/Library/Java/Home"; export JAVA_HOME
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=$(java-config --jre-home)
+  fi
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=$(cygpath --unix "$JAVA_HOME")
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=$(cygpath --path --unix "$CLASSPATH")
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$JAVA_HOME" ] && [ -d "$JAVA_HOME" ] &&
+    JAVA_HOME="$(cd "$JAVA_HOME" || (echo "cannot cd into $JAVA_HOME."; exit 1); pwd)"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="$(which javac)"
+  if [ -n "$javaExecutable" ] && ! [ "$(expr "\"$javaExecutable\"" : '\([^ ]*\)')" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=$(which readlink)
+    if [ ! "$(expr "$readLink" : '\([^ ]*\)')" = "no" ]; then
+      if $darwin ; then
+        javaHome="$(dirname "\"$javaExecutable\"")"
+        javaExecutable="$(cd "\"$javaHome\"" && pwd -P)/javac"
+      else
+        javaExecutable="$(readlink -f "\"$javaExecutable\"")"
+      fi
+      javaHome="$(dirname "\"$javaExecutable\"")"
+      javaHome=$(expr "$javaHome" : '\(.*\)/bin')
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="$(\unset -f command 2>/dev/null; \command -v java)"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=$(cd "$wdir/.." || exit 1; pwd)
+    fi
+    # end of workaround
+  done
+  printf '%s' "$(cd "$basedir" || exit 1; pwd)"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    # Remove \r in case we run on Windows within Git Bash
+    # and check out the repository with auto CRLF management
+    # enabled. Otherwise, we may read lines that are delimited with
+    # \r\n and produce $'-Xarg\r' rather than -Xarg due to word
+    # splitting rules.
+    tr -s '\r\n' ' ' < "$1"
+  fi
+}
+
+log() {
+  if [ "$MVNW_VERBOSE" = true ]; then
+    printf '%s\n' "$1"
+  fi
+}
+
+BASE_DIR=$(find_maven_basedir "$(dirname "$0")")
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}; export MAVEN_PROJECTBASEDIR
+log "$MAVEN_PROJECTBASEDIR"
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+wrapperJarPath="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar"
+if [ -r "$wrapperJarPath" ]; then
+    log "Found $wrapperJarPath"
+else
+    log "Couldn't find $wrapperJarPath, downloading it ..."
+
+    if [ -n "$MVNW_REPOURL" ]; then
+      wrapperUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
+    else
+      wrapperUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
+    fi
+    while IFS="=" read -r key value; do
+      # Remove '\r' from value to allow usage on windows as IFS does not consider '\r' as a separator ( considers space, tab, new line ('\n'), and custom '=' )
+      safeValue=$(echo "$value" | tr -d '\r')
+      case "$key" in (wrapperUrl) wrapperUrl="$safeValue"; break ;;
+      esac
+    done < "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
+    log "Downloading from: $wrapperUrl"
+
+    if $cygwin; then
+      wrapperJarPath=$(cygpath --path --windows "$wrapperJarPath")
+    fi
+
+    if command -v wget > /dev/null; then
+        log "Found wget ... using wget"
+        [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--quiet"
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget $QUIET "$wrapperUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget $QUIET --http-user="$MVNW_USERNAME" --http-password="$MVNW_PASSWORD" "$wrapperUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        log "Found curl ... using curl"
+        [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--silent"
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl $QUIET -o "$wrapperJarPath" "$wrapperUrl" -f -L || rm -f "$wrapperJarPath"
+        else
+            curl $QUIET --user "$MVNW_USERNAME:$MVNW_PASSWORD" -o "$wrapperJarPath" "$wrapperUrl" -f -L || rm -f "$wrapperJarPath"
+        fi
+    else
+        log "Falling back to using Java to download"
+        javaSource="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        javaClass="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.class"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaSource=$(cygpath --path --windows "$javaSource")
+          javaClass=$(cygpath --path --windows "$javaClass")
+        fi
+        if [ -e "$javaSource" ]; then
+            if [ ! -e "$javaClass" ]; then
+                log " - Compiling MavenWrapperDownloader.java ..."
+                ("$JAVA_HOME/bin/javac" "$javaSource")
+            fi
+            if [ -e "$javaClass" ]; then
+                log " - Running MavenWrapperDownloader.java ..."
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$wrapperUrl" "$wrapperJarPath") || rm -f "$wrapperJarPath"
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+# If specified, validate the SHA-256 sum of the Maven wrapper jar file
+wrapperSha256Sum=""
+while IFS="=" read -r key value; do
+  case "$key" in (wrapperSha256Sum) wrapperSha256Sum=$value; break ;;
+  esac
+done < "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
+if [ -n "$wrapperSha256Sum" ]; then
+  wrapperSha256Result=false
+  if command -v sha256sum > /dev/null; then
+    if echo "$wrapperSha256Sum  $wrapperJarPath" | sha256sum -c > /dev/null 2>&1; then
+      wrapperSha256Result=true
+    fi
+  elif command -v shasum > /dev/null; then
+    if echo "$wrapperSha256Sum  $wrapperJarPath" | shasum -a 256 -c > /dev/null 2>&1; then
+      wrapperSha256Result=true
+    fi
+  else
+    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available."
+    echo "Please install either command, or disable validation by removing 'wrapperSha256Sum' from your maven-wrapper.properties."
+    exit 1
+  fi
+  if [ $wrapperSha256Result = false ]; then
+    echo "Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper might be compromised." >&2
+    echo "Investigate or delete $wrapperJarPath to attempt a clean download." >&2
+    echo "If you updated your Maven version, you need to update the specified wrapperSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=$(cygpath --path --windows "$JAVA_HOME")
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=$(cygpath --path --windows "$CLASSPATH")
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=$(cygpath --path --windows "$MAVEN_PROJECTBASEDIR")
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $*"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+# shellcheck disable=SC2086 # safe args
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
--- a/mvnw.cmd
+++ b/mvnw.cmd
@ -0,0 +1,205 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.2.0
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set WRAPPER_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET WRAPPER_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET WRAPPER_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %WRAPPER_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%WRAPPER_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM If specified, validate the SHA-256 sum of the Maven wrapper jar file
+SET WRAPPER_SHA_256_SUM=""
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperSha256Sum" SET WRAPPER_SHA_256_SUM=%%B
+)
+IF NOT %WRAPPER_SHA_256_SUM%=="" (
+    powershell -Command "&{"^
+       "$hash = (Get-FileHash \"%WRAPPER_JAR%\" -Algorithm SHA256).Hash.ToLower();"^
+       "If('%WRAPPER_SHA_256_SUM%' -ne $hash){"^
+       "  Write-Output 'Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper might be compromised.';"^
+       "  Write-Output 'Investigate or delete %WRAPPER_JAR% to attempt a clean download.';"^
+       "  Write-Output 'If you updated your Maven version, you need to update the specified wrapperSha256Sum property.';"^
+       "  exit 1;"^
+       "}"^
+       "}"
+    if ERRORLEVEL 1 goto error
+)
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%
--- a/pom.xml
+++ b/pom.xml
@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>3.2.1</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>entgra</groupId>
+	<artifactId>mailsender</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>mailsender</name>
+	<description>send a mail for customer with attachments</description>
+	<properties>
+		<java.version>21</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-mail</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>javax.mail</groupId>
+			<artifactId>javax.mail-api</artifactId>
+			<version>1.6.2</version>
+		</dependency>
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<version>8.0.33</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jdbc</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-test</artifactId>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+<!--				<version>2.6.4</version>-->
+				<configuration>
+					<excludes>
+						<exclude>
+							<groupId>org.projectlombok</groupId>
+							<artifactId>lombok</artifactId>
+						</exclude>
+					</excludes>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
--- a/src/main/java/entgra/mailsender/Config/AppConfig.java
+++ b/src/main/java/entgra/mailsender/Config/AppConfig.java
@ -0,0 +1,42 @@
+package entgra.mailsender.Config;
+
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.JavaMailSenderImpl;
+
+import java.util.Properties;
+
+@Configuration
+public class AppConfig {
+    @Value("${spring.mail.host}")
+    private String mailHost;
+
+    @Value("${spring.mail.port}")
+    private String mailPort;
+
+    @Value("${spring.mail.username}")
+    private String mailUsername;
+
+    @Value("${spring.mail.password}")
+    private String mailPassword;
+
+    @Bean
+    public JavaMailSender getJavaMailSender(){
+        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();
+        javaMailSender.setHost(mailHost);
+        javaMailSender.setPort(Integer.parseInt(mailPort));
+        javaMailSender.setUsername(mailUsername);
+        javaMailSender.setPassword(mailPassword);
+
+        Properties props = javaMailSender.getJavaMailProperties();
+        props.put("mail.smtp.starttls.enable", "true");
+
+        return javaMailSender;
+    }
+
+
+
+}
--- a/src/main/java/entgra/mailsender/Config/DataSourceConfig.java
+++ b/src/main/java/entgra/mailsender/Config/DataSourceConfig.java
@ -0,0 +1,35 @@
+package entgra.mailsender.Config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+import javax.sql.DataSource;
+
+@Configuration
+public class DataSourceConfig {
+    @Value("${spring.datasource.url}")
+    private String dbUrl;
+
+    @Value("${spring.datasource.username}")
+    private String dbUserName;
+
+    @Value("${spring.datasource.password}")
+    private String dbPassword;
+
+    @Value("${spring.datasource.driver-class-name}")
+    private String dbDriver;
+
+    @Primary
+    @Bean
+    public DataSource dataSource(){
+        return DataSourceBuilder.create()
+                .url(dbUrl)
+                .username(dbUserName)
+                .password(dbPassword)
+                .driverClassName(dbDriver)
+                .build();
+    }
+}
--- a/src/main/java/entgra/mailsender/Controller/MailController.java
+++ b/src/main/java/entgra/mailsender/Controller/MailController.java
@ -0,0 +1,47 @@
+package entgra.mailsender.Controller;
+
+
+import entgra.mailsender.DTO.MailModel;
+import entgra.mailsender.Service.MailService;
+import entgra.mailsender.exception.MailException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.mail.MessagingException;
+import javax.naming.ServiceUnavailableException;
+import java.io.IOException;
+import java.sql.SQLException;
+
+@RestController
+@RequestMapping("/api/message-distribution/email")
+public class MailController {
+    @Autowired
+    public MailService mailService;
+
+    private static final Logger logger = LoggerFactory.getLogger(MailController.class);
+
+    @PostMapping
+    public ResponseEntity<String> sendEmail(@ModelAttribute MailModel emailModel) {
+        String msg;
+        try {
+            mailService.sendEmail(emailModel);
+            msg = "Email sent successfully";
+            return ResponseEntity.ok(msg);
+        } catch (MailException e) {
+            msg = "Invalid email address";
+            logger.error(msg, e);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(msg);
+        } catch (MessagingException | SQLException | IOException | ServiceUnavailableException exception) {
+            msg = "Failed to send email";
+            logger.error(msg, exception);
+            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(msg + exception);
+        }
+    }
+}
--- a/src/main/java/entgra/mailsender/DAO/Impl/MailDAOImpl.java
+++ b/src/main/java/entgra/mailsender/DAO/Impl/MailDAOImpl.java
@ -0,0 +1,198 @@
+package entgra.mailsender.DAO.Impl;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import entgra.mailsender.DAO.MailDAO;
+import entgra.mailsender.DTO.MailModel;
+import entgra.mailsender.exception.DatabaseAccessException;
+import entgra.mailsender.exception.FileConversionException;
+import entgra.mailsender.exception.MailProcessingException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import javax.sql.DataSource;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.sql.SQLException;
+import java.sql.PreparedStatement;
+import java.sql.Connection;
+import java.sql.Timestamp;
+import java.sql.Types;
+import java.sql.ResultSet;
+import java.sql.Blob;
+import java.sql.Date;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+@Component
+public class MailDAOImpl implements MailDAO {
+
+    private static final Logger logger = LoggerFactory.getLogger(MailDAOImpl.class);
+
+    private DataSource dataSource;
+
+    public MailDAOImpl(DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    @Override
+    public int addMail(MailModel mailModel) throws SQLException {
+        try {
+            PreparedStatement stmt;
+            Connection conn = dataSource.getConnection();
+            stmt = conn.prepareStatement("INSERT INTO EMAIL (EMAIL_ADDRESS, MSG_TEMPLATE, PRIORITY, ATTACHMENT," +
+                            " PARAMETERS, TIME, FILENAME, EXPIRY_AT,UUID) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
+                    PreparedStatement.RETURN_GENERATED_KEYS);
+            Timestamp current_time = new Timestamp(System.currentTimeMillis());
+            String parametersJson = new ObjectMapper().writeValueAsString(mailModel.getParameters());
+            stmt.setString(1, mailModel.getEmailAddress());
+            stmt.setString(2, mailModel.getMsgTemplate());
+            stmt.setInt(3, mailModel.getPriority());
+
+            // Set attachment only if it is present
+            if (mailModel.getAttachment() != null) {
+                stmt.setBytes(4, mailModel.getAttachment().getBytes());
+            } else {
+                stmt.setNull(4, Types.BLOB);
+            }
+
+            stmt.setString(5, parametersJson);
+            stmt.setTimestamp(6, current_time);
+            if (mailModel.getAttachment() != null) {
+                String filename = mailModel.getAttachment().getOriginalFilename();
+                stmt.setString(7, filename);
+            } else {
+                stmt.setNull(7, Types.VARCHAR);
+            }
+            stmt.setDate(8, mailModel.getExpiry_at());
+            stmt.setString(9, mailModel.getUuId());
+            stmt.executeUpdate();
+
+        } catch (SQLException e) {
+            logger.info(e.getMessage());
+            throw new SQLException("error processing sql !!", e);
+        } catch (IOException e) {
+            logger.info(e.getMessage());
+            throw new MailProcessingException("Error processing mailModel", e);
+        }
+
+        return 0;
+    }
+
+
+    @Override
+    public List<MailModel> getUnsentMessages() {
+
+        String sql = "SELECT E.* FROM EMAIL E LEFT JOIN SENTEMAIL SE ON E.UUID = SE.UUID WHERE SE.UUID IS NULL AND" +
+                "(E.EXPIRY_AT IS NULL OR E.EXPIRY_AT > CURRENT_DATE)";
+
+        List<MailModel> unsentMails = new ArrayList<>();
+
+        try (Connection connection = dataSource.getConnection();
+             PreparedStatement statement = connection.prepareStatement(sql);
+             ResultSet rs = statement.executeQuery()) {
+            while (rs.next()) {
+                MailModel mailModel = new MailModel();
+                mailModel.setUuId(rs.getString("UUID"));
+                mailModel.setPriority(rs.getInt("PRIORITY"));
+                mailModel.setExpiry_at(rs.getDate("EXPIRY_AT"));
+                unsentMails.add(mailModel);
+            }
+        } catch (SQLException e) {
+            logger.info(e.getMessage());
+            throw new DatabaseAccessException("Error accessing database", e);
+        }
+        return unsentMails;
+
+    }
+
+    @Override
+    public MailModel getMailDetails(String uuId) {
+        String sql = "SELECT * FROM EMAIL WHERE UUID = ?";
+        MailModel mailModel = new MailModel();
+
+        try {
+            Connection conn = dataSource.getConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, uuId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    while (rs.next()) {
+                        mailModel.setEmailId(rs.getInt("EMAIL_ID"));
+                        mailModel.setUuId(rs.getString("UUID"));
+                        mailModel.setEmailAddress(rs.getString("EMAIL_ADDRESS"));
+                        mailModel.setMsgTemplate(rs.getString("MSG_TEMPLATE"));
+                        mailModel.setPriority(rs.getInt("PRIORITY"));
+
+                        String jsonData = rs.getString("PARAMETERS");
+                        List<MailModel.Parameter> parameters = parseJsonParameters(jsonData);
+                        mailModel.setParameters(parameters);
+
+                        if (rs.getString("FILENAME") != null) {
+                            String filename = rs.getString("FILENAME");
+                            mailModel.setFilename(filename);
+
+                            Blob blob = rs.getBlob("ATTACHMENT");
+                            File file = convertBlobToFile(blob, filename);
+                            mailModel.setFile(file);
+                        }
+                    }
+                    return mailModel;
+                } catch (IOException e) {
+                    logger.info(e.getMessage());
+                    throw new MailProcessingException("Error processing mail", e);
+                }
+            }
+        } catch (SQLException e) {
+            logger.info(e.getMessage());
+            throw new DatabaseAccessException("Error accessing database", e);
+        }
+
+    }
+
+    private List<MailModel.Parameter> parseJsonParameters(String parametersJson) {
+        try {
+            ObjectMapper objectMapper = new ObjectMapper();
+            return objectMapper.readValue(parametersJson, new TypeReference<>() {
+            });
+        } catch (IOException e) {
+            logger.info(e.getMessage());
+            throw new IllegalArgumentException("Error parsing parameters JSON", e);
+        }
+    }
+
+    public static File convertBlobToFile(Blob blob, String fileName) throws IOException, SQLException {
+        File file = new File(fileName);
+        try (FileOutputStream outputStream = new FileOutputStream(file)) {
+            InputStream inputStream = blob.getBinaryStream();
+            byte[] buffer = new byte[1024];
+            while (inputStream.read(buffer) > 0) {
+                outputStream.write(buffer);
+            }
+        } catch (IOException e) {
+            logger.info(e.getMessage());
+            throw new FileConversionException("Error converting Blob to File", e);
+        }
+        return file;
+    }
+
+    public void addToSentMail(String uuId) {
+        try {
+            PreparedStatement stmt;
+            Connection connection = dataSource.getConnection();
+            stmt = connection.prepareStatement("INSERT INTO SENTEMAIL (UUID,SENT_TIME) VALUE (?,?)");
+            stmt.setString(1, uuId);
+            stmt.setDate(2, Date.valueOf(LocalDate.now()));
+            stmt.execute();
+        } catch (SQLException e) {
+            logger.info(e.getMessage());
+            throw new DatabaseAccessException("Error accessing database", e);
+        }
+    }
+
+
+}
--- a/src/main/java/entgra/mailsender/DAO/MailDAO.java
+++ b/src/main/java/entgra/mailsender/DAO/MailDAO.java
@ -0,0 +1,18 @@
+package entgra.mailsender.DAO;
+
+import entgra.mailsender.DTO.MailModel;
+
+import java.sql.SQLException;
+import java.util.List;
+
+
+public interface MailDAO {
+     int addMail(MailModel mailModel) throws SQLException;
+
+     MailModel getMailDetails(String uuId);
+
+     void addToSentMail(String  uuId);
+
+     List<MailModel> getUnsentMessages();
+
+}
--- a/src/main/java/entgra/mailsender/DTO/MailModel.java
+++ b/src/main/java/entgra/mailsender/DTO/MailModel.java
@ -0,0 +1,53 @@
+package entgra.mailsender.DTO;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.File;
+import java.util.List;
+import java.util.PrimitiveIterator;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+
+public class MailModel {
+
+    private int emailId;
+    private String emailAddress;
+    private String msgTemplate;
+    private int priority;
+    private List<Parameter> parameters;
+    private MultipartFile attachment;
+    private File file;
+    private String filename;
+    private java.sql.Date expiry_at;
+    private long insertionOrder;
+    private String uuId;
+
+
+
+    @Setter
+    @Getter
+    public static class Parameter{
+        private String key;
+        private String value;
+
+        public Parameter(){
+
+        }
+
+        public Parameter(String key, String value){
+            this.key = key;
+            this.value = value;
+        }
+
+    }
+
+
+
+}
--- a/src/main/java/entgra/mailsender/MailsenderApplication.java
+++ b/src/main/java/entgra/mailsender/MailsenderApplication.java
@ -0,0 +1,22 @@
+package entgra.mailsender;
+
+import entgra.mailsender.Service.MailService;
+import jakarta.annotation.PostConstruct;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MailsenderApplication {
+	@Autowired
+	private MailService mailService;
+
+	public static void main(String[] args) {
+		SpringApplication.run(MailsenderApplication.class, args);
+	}
+
+	@PostConstruct
+	public void init(){
+		mailService.syncMailWithDB();
+	}
+}
--- a/src/main/java/entgra/mailsender/Service/Impl/MailQueueServiceImpl.java
+++ b/src/main/java/entgra/mailsender/Service/Impl/MailQueueServiceImpl.java
@ -0,0 +1,74 @@
+package entgra.mailsender.Service.Impl;
+
+import entgra.mailsender.Controller.MailController;
+import entgra.mailsender.DAO.MailDAO;
+import entgra.mailsender.DTO.MailModel;
+import entgra.mailsender.Service.MailQueueService;
+import entgra.mailsender.util.PriorityQueueHolder;
+import lombok.RequiredArgsConstructor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.atomic.AtomicLong;
+
+@Service
+@RequiredArgsConstructor
+public class MailQueueServiceImpl implements MailQueueService {
+    private static final Logger logger = LoggerFactory.getLogger(MailQueueServiceImpl.class);
+
+    @Autowired
+    MailDAO mailDAO;
+
+    private volatile Thread processingThread;
+    private volatile boolean isProcessingMails;
+
+    @Override
+    public void enqueMails(List<MailModel> mailModelList){
+        BlockingQueue<MailModel> priorityQueue = PriorityQueueHolder.getInstance().getPriorityQueue();
+        AtomicLong insertionOrderCounter = PriorityQueueHolder.getInstance().getInsertionOrderCounter();
+        Set<MailModel> uniqueMails = PriorityQueueHolder.getInstance().getUniqueMails();
+        for (MailModel mailModel : mailModelList){
+            if (!PriorityQueueHolder.getInstance().getUniqueMails().contains(mailModel)){
+                mailModel.setInsertionOrder(insertionOrderCounter.getAndIncrement());
+                priorityQueue.add(mailModel);
+                uniqueMails.add(mailModel);
+            }
+        }
+
+    }
+
+    public MailModel getHighPriorityMail(){
+        BlockingQueue<MailModel> priorityQueue = PriorityQueueHolder.getInstance().getPriorityQueue();
+        Set<MailModel> uniqueMails = PriorityQueueHolder.getInstance().getUniqueMails();
+        if (PriorityQueueHolder.getInstance().getPriorityQueue().peek() != null){
+            MailModel mailModel = priorityQueue.poll();
+            uniqueMails.remove(mailModel);
+            return mailModel;
+        }
+        return null;
+    }
+
+    public void clearOnServerShutdown(){
+        BlockingQueue<MailModel> priorityQueue = PriorityQueueHolder.getInstance().getPriorityQueue();
+        if (processingThread != null){
+            while (isProcessingMails){
+                try {
+                    Thread.sleep(1000);
+                }catch (InterruptedException e){
+                    Thread.currentThread().interrupt();
+                    logger.info("Error waiting for the processing cycle to complete" + e.getMessage());
+                }
+                isProcessingMails = priorityQueue.peek() != null;
+            }
+            processingThread.interrupt();
+        }
+        logger.info("Server shutdown");
+    }
+
+
+}
--- a/src/main/java/entgra/mailsender/Service/Impl/MailServiceImpl.java
+++ b/src/main/java/entgra/mailsender/Service/Impl/MailServiceImpl.java
@ -0,0 +1,177 @@
+package entgra.mailsender.Service.Impl;
+
+import entgra.mailsender.DAO.MailDAO;
+import entgra.mailsender.DTO.MailModel;
+import entgra.mailsender.Service.MailQueueService;
+import entgra.mailsender.Service.MailService;
+import entgra.mailsender.exception.BadRequestException;
+import entgra.mailsender.exception.MailException;
+import entgra.mailsender.exception.QueueException;
+import entgra.mailsender.util.PriorityQueueHolder;
+import jakarta.annotation.PreDestroy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.stereotype.Service;
+
+import javax.naming.ServiceUnavailableException;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+
+@Service
+public class MailServiceImpl implements MailService {
+    private static final Logger logger = LoggerFactory.getLogger(MailServiceImpl.class);
+    private volatile boolean shutdownRequested = false;
+
+    @Autowired
+    private MailQueueService mailQueueService;
+
+    @PreDestroy
+    public void shutdown() {
+        shutdownRequested = true;
+        mailQueueService.clearOnServerShutdown();
+    }
+
+    @Autowired
+    private JavaMailSender javaMailSender;
+
+    @Autowired
+    private MailDAO mailDAO;
+
+    public void sendEmail(MailModel emailModel) throws MailException, SQLException, ServiceUnavailableException {
+        if (shutdownRequested) {
+            String msg = "Server is shutting down. Mail requests will not be accepted.";
+            logger.info(msg);
+            throw new ServiceUnavailableException(msg);
+        }
+
+        if (isValidEmailAddress(emailModel.getEmailAddress())) {
+            String msg = "Invalid Email address";
+            logger.warn(msg);
+            throw new BadRequestException(msg);
+        }
+
+        if (emailModel.getMsgTemplate().isBlank()) {
+            String msg = "Empty message template";
+            logger.warn(msg);
+            throw new BadRequestException(msg);
+        }
+
+        //generating the uuid
+        emailModel.setUuId(String.valueOf(UUID.randomUUID()));
+
+        mailDAO.addMail(emailModel); // save the mail details in the database and get the auto generated id
+
+        if (emailModel.getAttachment() != null) {
+            emailModel.setFilename(emailModel.getAttachment().getOriginalFilename());
+        }
+
+        //add to the priority queue
+        List<MailModel> mailModels = new ArrayList<>();
+        mailModels.add(emailModel);
+
+        try {
+            mailQueueService.enqueMails(mailModels);
+        } catch (Exception e) {
+            logger.info(e.getMessage());
+            throw new QueueException("Error processing Queue", e);
+        }
+
+        //send the high priority mail
+        while (PriorityQueueHolder.getInstance().getPriorityQueue().peek() != null) {
+            MailModel prioritizedMail = mailQueueService.getHighPriorityMail();
+
+            javaMailSender.send(mimeMessage -> {
+
+                MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
+                mimeMessageHelper.setTo(prioritizedMail.getEmailAddress());
+                mimeMessageHelper.setSubject("Bill details for March ");
+
+                StringBuilder emailBody = new StringBuilder();
+                emailBody.append(prioritizedMail.getMsgTemplate()).append("\n");
+
+                // Append parameters to email body
+                List<MailModel.Parameter> parameters = prioritizedMail.getParameters();
+
+                for (MailModel.Parameter parameter : parameters) {
+                    emailBody.append("\n").append(parameter.getKey()).append(": ").append(parameter.getValue());
+                }
+
+                // Append text to email body
+                mimeMessageHelper.setText(emailBody.toString(), false);
+
+                // Append attachments to email body
+                if (prioritizedMail.getAttachment() != null) {
+                    mimeMessageHelper.addAttachment(prioritizedMail.getFilename(), prioritizedMail.getAttachment());
+                }
+
+                //Store the sent mail to the table
+               mailDAO.addToSentMail(prioritizedMail.getUuId());
+
+            });
+        }
+
+
+    }
+
+    public boolean isValidEmailAddress(String email) {
+        String regex = "^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";
+        return !email.matches(regex);
+    }
+
+    public void syncMailWithDB() {
+        try {
+            List<MailModel> mailModels = mailDAO.getUnsentMessages();
+
+            if (!mailModels.isEmpty()) {
+                mailQueueService.enqueMails(mailModels);
+            }
+        } catch (Exception e) {
+            logger.info(e.getMessage());
+            throw new QueueException("Error processing Queue", e);
+        }
+
+        while (PriorityQueueHolder.getInstance().getPriorityQueue().peek() != null) {
+            MailModel prioritizedMail = mailDAO.getMailDetails(mailQueueService.getHighPriorityMail().getUuId());
+
+
+            javaMailSender.send(mimeMessage -> {
+
+                        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
+                        mimeMessageHelper.setTo(prioritizedMail.getEmailAddress());
+                        mimeMessageHelper.setSubject("Bill details for March ");
+
+                        StringBuilder emailBody = new StringBuilder();
+                        emailBody.append(prioritizedMail.getMsgTemplate()).append("\n");
+
+                        // Append parameters to email body
+                        List<MailModel.Parameter> parameters = prioritizedMail.getParameters();
+                        for (MailModel.Parameter parameter : parameters) {
+                            emailBody.append("\n").append(parameter.getKey()).append(": ").append(parameter.getValue());
+                        }
+
+                        // Append text to email body
+                        mimeMessageHelper.setText(emailBody.toString(), false);
+
+                        // Append attachments to email body
+                        if (prioritizedMail.getAttachment() != null) {
+                            mimeMessageHelper.addAttachment(prioritizedMail.getFilename(), prioritizedMail.getFile());
+
+                        }
+
+                        //Store the sent mail to the table
+                        mailDAO.addToSentMail(prioritizedMail.getUuId());
+
+
+                    }
+            );
+        }
+    }
+
+
+}
--- a/src/main/java/entgra/mailsender/Service/MailQueueService.java
+++ b/src/main/java/entgra/mailsender/Service/MailQueueService.java
@ -0,0 +1,15 @@
+package entgra.mailsender.Service;
+
+import entgra.mailsender.DTO.MailModel;
+
+import java.util.List;
+
+public interface MailQueueService {
+
+    void enqueMails(List<MailModel> mailModelList);
+
+    MailModel getHighPriorityMail();
+
+    void clearOnServerShutdown();
+
+}
--- a/src/main/java/entgra/mailsender/Service/MailService.java
+++ b/src/main/java/entgra/mailsender/Service/MailService.java
@ -0,0 +1,22 @@
+package entgra.mailsender.Service;
+
+import entgra.mailsender.DTO.MailModel;
+import entgra.mailsender.exception.BadRequestException;
+import entgra.mailsender.exception.MailException;
+
+import javax.mail.MessagingException;
+import javax.naming.ServiceUnavailableException;
+import java.io.IOException;
+import java.sql.SQLException;
+
+
+public interface MailService  {
+     void sendEmail(MailModel emailModel) throws MessagingException, IOException, MailException, SQLException, ServiceUnavailableException;
+
+     boolean isValidEmailAddress(String email);
+
+     void syncMailWithDB();
+
+
+}
+
--- a/src/main/java/entgra/mailsender/exception/BadRequestException.java
+++ b/src/main/java/entgra/mailsender/exception/BadRequestException.java
@ -0,0 +1,10 @@
+package entgra.mailsender.exception;
+
+public class BadRequestException extends MailException{
+
+    public BadRequestException(String message, Throwable ex){ super(message, ex);}
+
+    public BadRequestException(String message) {
+        super(message);
+    }
+}
--- a/src/main/java/entgra/mailsender/exception/DatabaseAccessException.java
+++ b/src/main/java/entgra/mailsender/exception/DatabaseAccessException.java
@ -0,0 +1,11 @@
+package entgra.mailsender.exception;
+
+public class DatabaseAccessException extends RuntimeException{
+    public DatabaseAccessException(String message) {
+        super(message);
+    }
+
+    public DatabaseAccessException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
--- a/src/main/java/entgra/mailsender/exception/FileConversionException.java
+++ b/src/main/java/entgra/mailsender/exception/FileConversionException.java
@ -0,0 +1,11 @@
+package entgra.mailsender.exception;
+
+public class FileConversionException extends RuntimeException{
+    public FileConversionException(String message) {
+        super(message);
+    }
+
+    public FileConversionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
--- a/src/main/java/entgra/mailsender/exception/MailException.java
+++ b/src/main/java/entgra/mailsender/exception/MailException.java
@ -0,0 +1,30 @@
+package entgra.mailsender.exception;
+
+import lombok.Data;
+
+@Data
+public class MailException extends Exception{
+    private String errorMessage;
+
+    public MailException(){super();}
+
+    public MailException(Throwable cause) {
+        super(cause);
+    }
+
+    public MailException(String msg, Exception nestedEx) {
+        super(msg, nestedEx);
+        setErrorMessage(msg);
+    }
+
+    public MailException(String message, Throwable cause) {
+        super(message, cause);
+        setErrorMessage(message);
+    }
+
+    public MailException(String msg) {
+        super(msg);
+        setErrorMessage(msg);
+    }
+
+}
--- a/src/main/java/entgra/mailsender/exception/MailProcessingException.java
+++ b/src/main/java/entgra/mailsender/exception/MailProcessingException.java
@ -0,0 +1,11 @@
+package entgra.mailsender.exception;
+
+public class MailProcessingException extends RuntimeException{
+    public MailProcessingException(String msg){
+        super(msg);
+    }
+
+    public MailProcessingException(String msg, Throwable cause){
+        super(msg,cause);
+    }
+}
--- a/src/main/java/entgra/mailsender/exception/QueueException.java
+++ b/src/main/java/entgra/mailsender/exception/QueueException.java
@ -0,0 +1,11 @@
+package entgra.mailsender.exception;
+
+public class QueueException extends RuntimeException{
+    public QueueException(String message){
+        super(message);
+    }
+
+    public QueueException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
--- a/src/main/java/entgra/mailsender/util/PriorityQueueHolder.java
+++ b/src/main/java/entgra/mailsender/util/PriorityQueueHolder.java
@ -0,0 +1,32 @@
+package entgra.mailsender.util;
+
+import entgra.mailsender.DTO.MailModel;
+import lombok.Getter;
+
+import java.util.Comparator;
+import java.util.Set;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.PriorityBlockingQueue;
+import java.util.concurrent.atomic.AtomicLong;
+
+public class PriorityQueueHolder {
+
+    // Singleton instance
+    @Getter
+    private static final PriorityQueueHolder instance = new PriorityQueueHolder();
+    @Getter
+    private final AtomicLong insertionOrderCounter = new AtomicLong(1);
+
+    // PriorityBlockingQueue is thread-safe and supports ordering elements based on their natural order or a
+    //custom comparator.
+    @Getter
+    private final BlockingQueue<MailModel> priorityQueue = new PriorityBlockingQueue<>(100, Comparator
+            .comparingLong(MailModel::getPriority)
+            .thenComparing(MailModel::getExpiry_at)
+            .thenComparing(MailModel::getInsertionOrder));
+
+    @Getter
+    private final Set<MailModel> uniqueMails = ConcurrentHashMap.newKeySet();
+
+}
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@ -0,0 +1,12 @@
+spring.mail.host=smtp.gmail.com
+spring.mail.port=587
+spring.mail.username=chandrasegar@entgra.io
+spring.mail.password=kfgt idre luvt ismk
+spring.datasource.url=jdbc:mysql://localhost:3306/email_sending
+spring.datasource.username=root
+spring.datasource.password=StrongPassword123!
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+
+
+
+
--- a/src/test/java/entgra/mailsender/MailsenderApplicationTests.java
+++ b/src/test/java/entgra/mailsender/MailsenderApplicationTests.java
@ -0,0 +1,13 @@
+package entgra.mailsender;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class MailsenderApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}