Fix unsubscription email address.

Change-Id: Iac6491ead60a969e38634c72fdec29f00890c2ce
diff --git a/src/main/resources/templates/NewsletterSender/newsletter.txt b/src/main/resources/templates/NewsletterSender/newsletter.txt
index 1c4228f..f70673e 100644
--- a/src/main/resources/templates/NewsletterSender/newsletter.txt
+++ b/src/main/resources/templates/NewsletterSender/newsletter.txt
@@ -35,4 +35,4 @@
 You are receiving this email because you are subscribed to the MulkCMS
 newsletter.  To unsubscribe, send an email to:
 
-  <mulkcms+unsubscribe@benkard.de>
+  <mulkcms+unsubscribe@mail.benkard.de>