SMTP: experimental: remove Content-Type on create message to avoid 406 not acceptable with some Exchange servers.

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@752 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/exchange/ExchangeSession.java

@@ -613,7 +613,6 @@ public class ExchangeSession {
 
         PutMethod putmethod = new PutMethod(messageUrl);
         putmethod.setRequestHeader("Translate", "f");
-        putmethod.setRequestHeader("Content-Type", "message/rfc822");
         try {
             // use same encoding as client socket reader
             putmethod.setRequestEntity(new ByteArrayRequestEntity(messageBody.getBytes()));