diff --git a/sp-modules/simple-nixos-mailserver/auth-dovecot.nix b/sp-modules/simple-nixos-mailserver/auth-dovecot.nix
index a1559e9..0e9235d 100644
--- a/sp-modules/simple-nixos-mailserver/auth-dovecot.nix
+++ b/sp-modules/simple-nixos-mailserver/auth-dovecot.nix
@@ -87,7 +87,7 @@ in
   };
 
   services.dovecot2.extraConfig = ''
-    auth_mechanisms = xoauth2 oauthbearer
+    auth_mechanisms = xoauth2 oauthbearer plain login
 
     passdb {
       driver = oauth2