https://github.com/sjinks/docker-alpine-postfix-relay

Simple Postfix SMTP relay image
https://github.com/sjinks/docker-alpine-postfix-relay

Last synced: 10 months ago
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Simple Postfix SMTP relay image

• Host: GitHub
• URL: https://github.com/sjinks/docker-alpine-postfix-relay
• Owner: sjinks
• License: mit
• Created: 2021-05-10T01:21:26.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2025-08-18T18:56:09.000Z (10 months ago)
• Last Synced: 2025-08-18T20:42:39.380Z (10 months ago)
• Language: Shell
• Size: 416 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# docker-alpine-postfix-relay

wildwildangel/postfix-relay is a simple Postfix SMTP relay Docker image based on Alpine Linux. It has *no local authentication configured* and is supposed to run in a trusted environment.

# Environment Variables

The entry point requires the following environment variables:

  * `SERVER_HOSTNAME`: the hostname for this container;

  * `SMTP_SERVER`: the address of the SMTP server to use.

The following environment variables are optional:

  * `SMTP_PORT` (defaults to 587): the port of the target SMTP server (used together with `SERVER_HOSTNAME`);

  * `SMTP_USERNAME`: the username to authenticate with. If it is not empty, then it is mandatory to pass one of `SMTP_PASSWORD` or `SMTP_PASSWORD_FILE`;

  * `SMTP_PASSWORD_FILE`: the file containing the password of the authenticating user. The entry point script will read this file and assign its contents to the `SMTP_PASSWORD` variable;

  * `SMTP_PASSWORD`: the password of the authenticating user;

  * `SMTP_NETWORKS` (defaults to `10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16`): the list of networks that are allowed to relay emails via this server; 

  * `DEBUG`: set to `yes` to enable debugging (effectively executes `set -x`).