Merge pull request #375 from Megala21/master

Fixing EMM-1587

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

@@ -109,7 +109,7 @@ public class EmailSenderServiceImpl implements EmailSenderService {
                 Options options = new Options();
                 options.setProperty(MessageContext.TRANSPORT_HEADERS, headerMap);
                 options.setProperty("FORCE_CONTENT_TYPE_BASED_FORMATTER", "true");
-                options.setProperty(Constants.Configuration.MESSAGE_TYPE, "text/html");
+                options.setProperty(Constants.Configuration.MESSAGE_TYPE, "application/xml");
                 options.setProperty(Constants.Configuration.CONTENT_TYPE, "text/html");
                 options.setTo(new EndpointReference(EMAIL_URI_SCHEME + to));