diff --git a/app/src/main/res/xml/providers.xml b/app/src/main/res/xml/providers.xml
index ece71bc5fe..30d8868c39 100644
--- a/app/src/main/res/xml/providers.xml
+++ b/app/src/main/res/xml/providers.xml
@@ -99,6 +99,6 @@
         <smtp
             host="mail.gmx.com"
             port="587"
-            starttls="false" />
+            starttls="true" />
     </provider>
 </providers>