diff --git a/roles/monitoring-master/files/services_passive_mail_extern.conf b/roles/monitoring-master/files/services_passive_mail_extern.conf
index 8c83ae5..af36d7d 100644
--- a/roles/monitoring-master/files/services_passive_mail_extern.conf
+++ b/roles/monitoring-master/files/services_passive_mail_extern.conf
@@ -2,7 +2,7 @@ apply Service "MAIL-postfix-tls" {
 	import "generic-service"
 	check_command = "ssl"
 	vars.ssl_address = "mail.atlantishq.de"
-	vars.ssl_port = "465"
+	vars.ssl_port = "587"
  	assign where host.name == "mail"
 }