feat: add Mailu mail server template#1033
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Mailu 2024.06 mail server: front (nginx), admin, imap (dovecot), smtp (postfix), antispam (rspamd), Roundcube webmail and redis. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Adds a Mailu 2024.06 mail server template (
ghcr.io/mailu/*:2024.06, currently 2024.06.54).Stack
Minimal Mailu deployment:
front(nginx + mail proxy),admin,imap(Dovecot),smtp(Postfix),antispam(Rspamd),webmail(Roundcube) andredis. ClamAV/webdav/fetchmail are left out to keep the footprint reasonable (ClamAV alone needs >1 GB RAM); they can be added following the Mailu docs.Design decisions
*_ADDRESS=front/admin/imap/...), no fixed subnets and no pinned IPs, so it works with the dynamic networks of both normal and isolated deployments. The upstreamresolver(unbound, needs a static IP) is replaced by public DNSSEC-validating upstreams (dns: 1.1.1.1, 8.8.8.8) — required because the admin container refuses to boot without DNSSEC validation and Postfix uses DANE.SUBNET=172.16.0.0/12(user-editable env): the CIDR Mailu trusts for internal relay/XCLIENT/proxying. It covers Docker's default address pools; documented ininstructions.mdfor hosts with custom pools.front, but Dovecot only starts once TLS certs exist. Behind Traefik this deadlocks — unhealthy → Traefik drops the router → the ACME challenge can never be answered → certs never arrive. The template checks only nginx (127.0.0.1:10204/health), which breaks the cycle: web UI is routable immediately and Mailu's internal certbot can complete the HTTP-01 challenge through Traefik.TLS_FLAVOR=mail-letsencrypt: Traefik terminates HTTPS for the web UI; Mailu obtains its own Let's Encrypt certificate for the mail protocols via HTTP-01 through Traefik.instructions.md.admin@<domain>auto-created (INITIAL_ADMIN_MODE=ifmissing) with a generated password.Evidence (deployed on the demo instance)
fronthealthy; deploydone./→ 302/sso/login?url=/webmail/(200 «Mailu-Admin | Mailu»),/admin→ SSO login 200.POST /sso/login→ 302 →/admin/user/settings200 showing the logged-inadmin@<domain>and the Mail domains UI.220 <domain> ESMTP ready.sslip.iodemo domain, works on a real domain with HTTPS enabled).Closes #19
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