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Using an external reverse proxy

One of Mailu's use cases is as part of a larger services platform, where maybe other Web services are available on other FQDNs served from the same IP address.

In such a configuration, one would usually run a front-end reverse proxy to serve all Web contents based on criteria like the requested hostname (virtual hosts).

Traefik as reverse proxy

In your docker-compose.yml, remove the ports section of the front container and add a section like follows:

reverse-proxy:
  # The official v2 Traefik docker image
  image: traefik:v2.11
  # Enables the web UI and tells Traefik to listen to docker
  command:
    - "--providers.docker=true"
    - "--providers.docker.exposedbydefault=false"
    - "--providers.docker.allowEmptyServices=true"
    - "--entrypoints.web.address=:http"
    - "--entrypoints.websecure.address=:https"
    - "--entrypoints.smtp.address=:smtp"
    - "--entrypoints.submission.address=:submission"
    - "--entrypoints.submissions.address=:submissions"
    - "--entrypoints.imap.address=:imap"
    - "--entrypoints.imaps.address=:imaps"
    - "--entrypoints.pop3.address=:pop3"
    - "--entrypoints.pop3s.address=:pop3s"
    - "--entrypoints.sieve.address=:sieve"
    # - "--api.insecure=true"
    # - "--log.level=DEBUG"
  ports:
    - "25:25"
    - "80:80"
    - "443:443"
    - "465:465"
    - "587:587"
    - "993:993"
    - "995:995"
    - "110:110"
    - "143:143"
    - "4190:4190"
    # The Web UI (enabled by --api.insecure=true)
    # - "8080:8080"
  volumes:
    # So that Traefik can listen to the Docker events
    - /var/run/docker.sock:/var/run/docker.sock

and then add the following to the front section:

labels:
    - "traefik.enable=true"

    # the second part is important to ensure Mailu can get certificates from letsencrypt for all hostnames
    - "traefik.http.routers.web.rule=Host(`mail.example.com`) || PathPrefix(`/.well-known/acme-challenge/`)"
    - "traefik.http.routers.web.entrypoints=web"
    - "traefik.http.services.web.loadbalancer.server.port=80"

    # other FQDNS can be added here:
    - "traefik.tcp.routers.websecure.rule=HostSNI(`mail.example.com`) || HostSNI(`autoconfig.example.com`) || HostSNI(`mta-sts.example.com`)"
    - "traefik.tcp.routers.websecure.entrypoints=websecure"
    - "traefik.tcp.routers.websecure.tls.passthrough=true"
    - "traefik.tcp.routers.websecure.service=websecure"
    - "traefik.tcp.services.websecure.loadbalancer.server.port=443"
    - "traefik.tcp.services.websecure.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.smtp.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.smtp.entrypoints=smtp"
    - "traefik.tcp.routers.smtp.service=smtp"
    - "traefik.tcp.services.smtp.loadbalancer.server.port=25"
    - "traefik.tcp.services.smtp.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.submission.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.submission.entrypoints=submission"
    - "traefik.tcp.routers.submission.service=submission"
    - "traefik.tcp.services.submission.loadbalancer.server.port=587"
    - "traefik.tcp.services.submission.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.submissions.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.submissions.entrypoints=submissions"
    - "traefik.tcp.routers.submissions.service=submissions"
    - "traefik.tcp.services.submissions.loadbalancer.server.port=465"
    - "traefik.tcp.services.submissions.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.imap.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.imap.entrypoints=imap"
    - "traefik.tcp.routers.imap.service=imap"
    - "traefik.tcp.services.imap.loadbalancer.server.port=143"
    - "traefik.tcp.services.imap.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.imaps.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.imaps.entrypoints=imaps"
    - "traefik.tcp.routers.imaps.service=imaps"
    - "traefik.tcp.services.imaps.loadbalancer.server.port=993"
    - "traefik.tcp.services.imaps.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.pop3.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.pop3.entrypoints=pop3"
    - "traefik.tcp.routers.pop3.service=pop3"
    - "traefik.tcp.services.pop3.loadbalancer.server.port=110"
    - "traefik.tcp.services.pop3.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.pop3s.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.pop3s.entrypoints=pop3s"
    - "traefik.tcp.routers.pop3s.service=pop3s"
    - "traefik.tcp.services.pop3s.loadbalancer.server.port=995"
    - "traefik.tcp.services.pop3s.loadbalancer.proxyProtocol.version=2"

    - "traefik.tcp.routers.sieve.rule=HostSNI(`*`)"
    - "traefik.tcp.routers.sieve.entrypoints=sieve"
    - "traefik.tcp.routers.sieve.service=sieve"
    - "traefik.tcp.services.sieve.loadbalancer.server.port=4190"
    - "traefik.tcp.services.sieve.loadbalancer.proxyProtocol.version=2"
  healthcheck:
    test: ['NONE']

in mailu.env:

REAL_IP_FROM=192.168.203.0/24
PROXY_PROTOCOL=all-but-http
TRAEFIK_VERSION=v2
TLS_FLAVOR=mail-letsencrypt
WEBROOT_REDIRECT=/sso/login

Using the above configuration, Traefik will proxy all the traffic related to Mailu's FQDNs without requiring duplicate certificates.