Postfix satellite host
This image does not send emails (dumb host), it uses another smarthost such as Gmail to send the actual emails. Uses postfix queue features to retry sending temporary failed emails.
This has been tested with Gmail.
Configuration
TZ=Europe/Bucharest
MAIL_SMARTHOST_HOSTNAME=smtp-relay.gmail.com
MAIL_SMARTHOST_PORT=587
MAIL_SMARTHOST_USERNAME=email.address@gmail.com
MAIL_SMARTHOST_PASSWORD=secret
MAIL_DOMAIN=example.com
Gmail 2FA
Sending email through Gmail with 2FA active you need to:
- enable "less secure apps", read here: https://support.google.com/accounts/answer/6010255
- Generate an password to use instead of your Gmail password, read here: https://support.google.com/mail/answer/185833
Volumes
Use exposed volumes from /var/log and /var/spool/postfix to persist postfix state
Bibliography
- https://github.com/shamil/docker-postfix-relay
- https://github.com/Tecnativa/docker-postfix-relay
- https://github.com/LyleScott/docker-postfix-gmail-relay
- https://github.com/EnMobile/docker-postfix-gmail-relay
- https://github.com/eea/eea.docker.postfix
- https://www.linode.com/docs/email/postfix/configure-postfix-to-send-mail-using-gmail-and-google-apps-on-debian-or-ubuntu/