mhzawadi/postfix repository overview

⁠Postfix for Docker

Small image (~ 4MB) for Postfix based on Alpine. This image is only for outgoing messages and allows connection to the SMTP server from private networks⁠ (10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16) without authentication.

⁠Environment variables

⁠POSTFIX_DOMAIN

Set the domain name. Also sets the host name in the e-mail address if the host name is not an FQDN.

⁠POSTFIX_RELAYHOST

The relayhost parameter specifies the default host to send mail

⁠POSTFIX_SMTP_TLS_SECURITY_LEVEL

Set the default security level for outgoing mails.

- POSTFIX_SMTP_TLS_SECURITY_LEVEL="may"

Valid levels are none, may, encrypt, … see http://www.postfix.org/postconf.5.html#smtp_tls_security_level⁠

Default: may

⁠POSTFIX_SMTP_TLS_POLICY_MAPS

Override the default security level for outgoing mails per domain.

-e POSTFIX_SMTP_TLS_POLICY_MAPS="foo.example.com encrypt\nbar.example.com may"

Valid levels are none, may, encrypt, … see http://www.postfix.org/postconf.5.html#smtp_tls_security_level⁠

http://www.postfix.org/postconf.5.html#smtp_tls_policy_maps⁠

⁠Volumes

⁠/var/spool/postfix

To keep the unsent emails even when the container is restarted, create a volume for /var/spool/postfix.