Allow for setting any Postfix variables in the config file

[knipknap]

Stolen from wader/postfix-relay, I propose to add the following line to your entrypoint.sh:

for e in ${!POSTFIX_*} ; do postconf -e "${e:8}=${!e}" ; done

This allows for setting up postfix in a Docker swarm / compose, without having to mount a whole configfile. Usage:

  mail_relay:
    image: zixia/simple-mail-forwarder:1.1
    networks:
      - traefik-public
      - default
    deploy:
      labels:
        - traefik.enable=true
        - traefik.docker.network=traefik-public
        - traefik.constraint-label=traefik-public
        - traefik.tcp.routers.mail_relay.rule=HostSNI(`*`)
        - traefik.tcp.routers.mail_relay.entrypoints=smtp
        - traefik.tcp.routers.mail_relay.service=mail_relay
        - traefik.tcp.services.mail_relay.loadbalancer.server.port=25
    environment:
      - SMF_DOMAIN=domain1.com
      - |
        SMF_CONFIG=
        [email protected]:[email protected];
        [email protected]:[email protected];
      - POSTFIX_myhostname=smtp.domain1.com
      - POSTFIX_relay_domains="domain1.com domain2.com"
      - POSTFIX_smtpd_recipient_restrictions=permit_mynetworks, permit_sasl_authenticated

(note the last three lines)

[huan]

Please feel free to create a PR to implement it, and do not forget to add the related docs in README and unit tests as well.

[tamaro-skaljic]

@huan This issue can be closed, #92 implemented this feature.

[huan]

@tamaro-skaljic @knipknap @dgraziotin thank your very much for the efforts to enhance SMF!