[Dovecot] Postlogin socket owned by vmail

data/conf/dovecot/dovecot.conf

@@ -454,6 +454,8 @@ mail_max_userip_connections = 500
 service imap-postlogin {
   executable = script-login /usr/local/bin/postlogin.sh
   unix_listener imap-postlogin {
+    user = vmail
+    mode = 0660
   }
 }
 service stats {