Say mail's failure urgently, on every channel

A broken mailu was a warning, said only on the desk; refused or stuck
mail must reach the operator wherever they are (ADR 0355 §5, issue 691).

modules/mailu/module.json

@@ -5,6 +5,10 @@
     "policy": "record",
     "why": "people's mail: any change to how its containers are declared recreates them together in one send, and the mail is down for everyone until they are up again — a person chooses the moment (hq ADR 0242, issue 295)"
   },
+  "unhealthy": {
+    "severity": "urgent",
+    "why": "while mailu is broken, mail is refused or stuck for everyone with a mailbox here (hq ADR 0355, issue 687)"
+  },
   "capabilities": [
     "container-runtime"
   ],
@@ -697,7 +701,7 @@
   "jails": [
     {
       "name": "mailu-front",
-      "failregex": "^.*(?:imap|pop3|submission|managesieve)-login: .*\\(auth failed, \\d+ attempts(?: in \\d+ secs)?\\):.*rip=<HOST>(?:,|$)\n            ^.*client login failed: \"AUTH not supported\" while in http auth state, client: <HOST>, server: \\S+:25,",
+      "failregex": "^.*(?:imap|pop3|submission|managesieve)-login: .*\\(auth failed, \\d+ attempts(?: in \\d+ secs)?\\):.*rip=<HOST>(?:,|$)",
       "jail": "backend = systemd\njournalmatch = CONTAINER_NAME=mailu-front\nport = smtp,submission,submissions,imap,imaps,pop3,pop3s\nmaxretry = 3\nfindtime = 1d\nbantime = 1d"
     }
   ]