diff --git a/nbspplenumbot.sh b/nbspplenumbot.sh
index cfbb5c186e50a503b825fe9331d493f6399e01b5..144d51f79d9bfccb85239a48e2ab950ed5f631dc 100644
--- a/nbspplenumbot.sh
+++ b/nbspplenumbot.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-export MAIL_SERVER='mail.chaotikum.net';
+export MAIL_SERVER='mail.chaotikum.net:587';
 export MAIL_USER='noreply';
 export MAIL_PASSWORD='<MAIL_PASSWORD>';
 . /home/bots/scripts/nbspplenumbot/venv/bin/activate;