Wildcard certificate support about docker-mailserver-traefik

[youtous]

Hi,
I've not tested with wildcard certificate, but it should work using <domain>.
For *.localhost.com wildcard certificate, set localhost.com for DOMAINS and for the mailserver-traefik.renew.domain label

Could you try with this:

services:
  cert-renewer-traefik:
    image: youtous/mailserver-traefik:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ./acme.json:/tmp/traefik/acme.json:ro
    environment:
      - TRAEFIK_VERSION=2
      - CERTS_SOURCE=file
      - DOMAINS=localhost.com

  mailserver:
    image: tvial/docker-mailserver:latest
    hostname: mail
    domainname: localhost.com
    labels:
      - "mailserver-traefik.renew.domain=localhost.com" # tag the service 

[georglauterbach]

Works flawlessly. I really don't know why I did not try that earlier. Thank you very much. Maybe it's worth a shot writing this down somewhere - just in case someone gets in the same "trouble".

Therefore, this issue is solved.