Ban clients that try to log in on mail port 25

Port 25 takes no login, so a client that tries is guessing passwords;
mailu's jail only matched Dovecot's failures and never banned them
(issue 708). Relay attempts stay unbanned: postfix already refuses them.

modules/mailu/module.json

@@ -697,7 +697,7 @@
   "jails": [
     {
       "name": "mailu-front",
-      "failregex": "^.*(?:imap|pop3|submission|managesieve)-login: .*\\(auth failed, \\d+ attempts(?: in \\d+ secs)?\\):.*rip=<HOST>(?:,|$)",
+      "failregex": "^.*(?:imap|pop3|submission|managesieve)-login: .*\\(auth failed, \\d+ attempts(?: in \\d+ secs)?\\):.*rip=<HOST>(?:,|$)\n            ^.*client login failed: \"AUTH not supported\" while in http auth state, client: <HOST>, server: \\S+:25,",
       "jail": "backend = systemd\njournalmatch = CONTAINER_NAME=mailu-front\nport = smtp,submission,submissions,imap,imaps,pop3,pop3s\nmaxretry = 3\nfindtime = 1d\nbantime = 1d"
     }
   ]