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https://github.com/tozd/docker-postfix

Postfix Docker image. Read-only mirror of https://gitlab.com/tozd/docker/postfix
https://github.com/tozd/docker-postfix

docker docker-image postfix

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Postfix Docker image. Read-only mirror of https://gitlab.com/tozd/docker/postfix

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README 

        
# tozd/postfix



Available as:



- [`tozd/postfix`](https://hub.docker.com/r/tozd/postfix)

- [`registry.gitlab.com/tozd/docker/postfix`](https://gitlab.com/tozd/docker/postfix/container_registry)



## Image inheritance



[`tozd/base`](https://gitlab.com/tozd/docker/base) ← [`tozd/dinit`](https://gitlab.com/tozd/docker/dinit) ← `tozd/postfix`



## Tags



- `ubuntu-trusty`: Postfix 2.11.0

- `ubuntu-xenial`: Postfix 3.1.0

- `ubuntu-bionic`: Postfix 3.3.0

- `ubuntu-focal`: Postfix 3.4.13

- `ubuntu-jammy`: Postfix 3.6.4

- `alpine-38`: Postfix 3.3.0

- `alpine-310`: Postfix 3.4.7

- `alpine-312`: Postfix 3.5.16

- `alpine-314`: Postfix 3.6.4

- `alpine-316`: Postfix 3.7.6



## Volumes



- `/var/log/postfix`: Log files when `LOG_TO_STDOUT` is not set to `1`. Logs are **not** rotated on versions older than Postfix 3.4.

- `/var/spool/postfix`: Persist this volume to not lose state.



## Variables



- `MAILNAME`: `/etc/mailname` and [`myhostname`](https://www.postfix.org/postconf.5.html#myhostname) Postfix configuration option are set to this value.

- `MY_NETWORKS`: [`mynetworks`](https://www.postfix.org/postconf.5.html#mynetworks)

  Postfix configuration option is set to this value. Default is `172.17.0.0/16 127.0.0.0/8`.

- `MY_DESTINATION`: [`mydestination`](https://www.postfix.org/postconf.5.html#mynetworks)

  Postfix configuration option is set to this value.

  If you are not extending this Docker image to also deliver local (inside the container)

  e-mails then you generally do not have to change the default.

  Default is `localhost.localdomain, localhost`.

- `ROOT_ALIAS`: E-mail to which local (inside the container) e-mails to `root` user

  are send.

  If you are not extending this Docker image you generally do not have to set this

  as there are no e-mails send to the `root` user from inside the container.

- `LOG_TO_STDOUT`: If set to `1` output logs to stdout (retrievable using `docker logs`) instead of log volumes. Available for Postfix 3.4 and newer.



## Ports



- `25/tcp`: SMTP port.

- `465/tcp`: SMTPS port.

- `587/tcp`: Mail submission port.



## Description



Docker image providing [Postfix](http://www.postfix.org/).



You should make sure you mount spool volume (`/var/spool/postfix`) so that you do not

lose e-mail data when you are recreating a container. If a volume is empty, image

will initialize it at the first startup.



When `LOG_TO_STDOUT` is set to `1`, Docker image logs output to stdout and stderr. All stdout output is JSON.



By default it is configured for sending outbound e-mails. Otherwise, you can extend

the image and configure it differently. See these examples:



- [cloyne/postfix](https://github.com/cloyne/docker-postfix), which extends it to integrate

  it with [tozd/sympa](https://gitlab.com/tozd/docker/sympa) mailing lists service

- [tozd/mail](https://gitlab.com/tozd/docker/mail), which extends it to provide a full-fledged

  e-mail service with virtual users



Remember that for the best e-mail delivery external IP should match the hostname it resolves to.

You might find [tozd/external-ip](https://gitlab.com/tozd/docker/external-ip) Docker image useful

for this.



If you are extending this image, you can add two scripts which will be run at a container startup:



- `/etc/service/postfix/run.config` – to prepare any custom configuration, before anything else is run

- `/etc/service/postfix/run.initialization` – will be run after the container is initialized, but before the

  Postfix daemon is run



If you just need programs inside your Docker images to send e-mails using `sendmail` program

locally, consider using [tozd/mailer](https://gitlab.com/tozd/docker/mailer) or

[tozd/nginx-mailer](https://gitlab.com/tozd/docker/nginx-mailer) Docker image as your base.

This `tozd/postfix` Docker image delivers e-mails to wide Internet by itself.

Then you can configure `tozd/mailer`-based containers to relay e-mails to one `tozd/postfix`

container which then sends e-mails out.



## GitHub mirror



There is also a [read-only GitHub mirror available](https://github.com/tozd/docker-postfix),

if you need to fork the project there.