Sending email only when the mail transport is enabled.

components/email-sender/org.wso2.carbon.email.sender.core/src/main/java/org/wso2/carbon/email/sender/core/service/EmailSenderServiceImpl.java

@@ -71,12 +71,14 @@ public class EmailSenderServiceImpl implements EmailSenderService {
                 if(EmailSenderDataHolder.getInstance().getConfigurationContextService()
                         .getServerConfigContext().getAxisConfiguration().getTransportOut(transportSenderName) == null){
                     log.warn("Email invitation is not sent as the email is not configured.");
+                } else {
+                    threadPoolExecutor.submit(new EmailSender(recipient, emailData.getSubject(), emailData.getBody()));
                 }
             } catch (ContentProcessingInterruptedException e) {
                 throw new EmailSendingFailedException("Error occurred while retrieving email content to be " +
                         "sent for recipient '" + recipient + "'", e);
             }
-            threadPoolExecutor.submit(new EmailSender(recipient, emailData.getSubject(), emailData.getBody()));
+
         }
     }