The cert-sync timer waited forever for a mail/mail-tls secret no
Certificate resource ever requested — Stalwart served self-signed certs
since install, so mail clients refused the IMAP handshake ('cannot verify
account name or password' in Apple Mail). Adds the cert-manager
Certificate (HTTP-01 via Traefik on :80) and documents the v0.16 wrinkle:
TLS files aren't read from config anymore; a one-time file-backed
x:Certificate object (created via management JMAP) points at the synced
paths, after which cert-sync renewals keep working unchanged. Verified:
:993 now serves the Let's Encrypt cert, verify rc=0.
Ronni Baslund