diff --git a/synapse/homeserver.yaml b/synapse/homeserver.yaml
index d258af9..e8595b5 100644
--- a/synapse/homeserver.yaml
+++ b/synapse/homeserver.yaml
@@ -53,7 +53,7 @@ serve_server_wellknown: true
 # vim:ft=yaml
 email:
   smtp_host: mail.host-nb.de
-  smtp_port: 25
+  smtp_port: 465
   smtp_user: "relay@mail-nb.de"
   smtp_pass: "uqCvDcKUgmd3"
   require_transport_security: true