Index: typo3/contrib/swiftmailer/classes/Swift/Transport/SimpleMailInvoker.php
===================================================================
--- typo3/contrib/swiftmailer/classes/Swift/Transport/SimpleMailInvoker.php	(revision 42568)
+++ typo3/contrib/swiftmailer/classes/Swift/Transport/SimpleMailInvoker.php	(working copy)
@@ -45,6 +45,10 @@
    */
   public function mail($to, $subject, $body, $headers = null, $extraParams = null)
   {
+
+        // Prevent message from breaking by SMTP-syntaxed End of Mail: "\n.\n".
+    $body = preg_replace('/^\.$/m','. ',$body);
+
     if (!ini_get('safe_mode'))
     {
       return mail($to, $subject, $body, $headers, $extraParams);