diff --git a/systems/x86_64-linux/mx/mailserver.nix b/systems/x86_64-linux/mx/mailserver.nix
index f086d7c..7dd0547 100644
--- a/systems/x86_64-linux/mx/mailserver.nix
+++ b/systems/x86_64-linux/mx/mailserver.nix
@@ -244,7 +244,7 @@
     extraConfig = ''
       # starttls needed for authentication, so the fqdn required to match
       # the certificate
-      $config['smtp_server'] = "tls://${config.mailserver.fqdn}:587";
+      $config['smtp_server'] = "ssl://${config.mailserver.fqdn}:465";
       $config['smtp_user'] = "%u";
       $config['smtp_pass'] = "%p";
       $config['imap_host'] = "ssl://${config.mailserver.fqdn}";