90 lines
4.6 KiB
Markdown
90 lines
4.6 KiB
Markdown
# docker-postfix
|
|
[](https://hub.docker.com/r/juanluisbaptiste/postfix/build/)
|
|
[](https://hub.docker.com/r/juanluisbaptiste/postfix/)
|
|
[](https://hub.docker.com/r/juanluisbaptiste/postfix/)
|
|
|
|
Simple Postfix SMTP TLS relay [docker](http://www.docker.com) image with no local authentication enabled (to be run in a secure LAN).
|
|
|
|
It also includes rsyslog to enable logging to stdout.
|
|
|
|
|
|
_If you want to follow the development of this project check out [my blog](http://not403.blogspot.com.co/search/label/postfix)._
|
|
|
|
### Available image tags
|
|
|
|
This image has been built on CentOS 7 since its inception, but the new CentOS 8 does [not include supervisor](https://github.com/juanluisbaptiste/docker-postfix/issues/16) anymore, so I have started migrating this image to Alpine linux. So currently there are two image tags available:
|
|
|
|
* juanluisbaptiste/postfix:latest, current CentOS 7 based image
|
|
* juanluisbaptiste/postfix:alpine, new Alpine based image
|
|
|
|
If testing goes well for some time, then the current CentOS image will be replaced by the new Alpine one, and _latest_ tag will point to it.
|
|
|
|
### Build instructions
|
|
|
|
Clone this repo and then:
|
|
|
|
cd docker-Postfix
|
|
sudo docker build -t juanluisbaptiste/postfix .
|
|
|
|
Or you can use the provided [docker-compose](https://github.com/juanluisbaptiste/docker-postfix/blob/master/docker-compose.dev.yml) files:
|
|
|
|
sudo docker-compose build
|
|
|
|
For more information on using multiple compose files [see here](https://docs.docker.com/compose/production/). You can also find a prebuilt docker image from [Docker Hub](https://registry.hub.docker.com/u/juanluisbaptiste/postfix/), which can be pulled with this command:
|
|
|
|
sudo docker pull juanluisbaptiste/postfix:latest
|
|
|
|
### How to run it
|
|
|
|
The following env variables need to be passed to the container:
|
|
|
|
* `SMTP_SERVER` Server address of the SMTP server to use.
|
|
* `SMTP_PORT` (Optional, Default value: 587) Port address of the SMTP server to use.
|
|
* `SMTP_USERNAME` Username to authenticate with.
|
|
* `SMTP_PASSWORD` Password of the SMTP user.
|
|
* `SERVER_HOSTNAME` Server hostname for the Postfix container. Emails will appear to come from the hostname's domain.
|
|
|
|
The following env variable(s) are optional.
|
|
* `SMTP_HEADER_TAG` This will add a header for tracking messages upstream. Helpful for spam filters. Will appear as "RelayTag: ${SMTP_HEADER_TAG}" in the email headers.
|
|
|
|
* `SMTP_NETWORKS` Setting this will allow you to add additional, comma seperated, subnets to use the relay. Used like
|
|
-e SMTP_NETWORKS='xxx.xxx.xxx.xxx/xx,xxx.xxx.xxx.xxx/xx'
|
|
|
|
To use this container from anywhere, the 25 port or the one specified by `SMTP_PORT` needs to be exposed to the docker host server:
|
|
|
|
docker run -d --name postfix -p "25:25" \
|
|
-e SMTP_SERVER=smtp.bar.com \
|
|
-e SMTP_USERNAME=foo@bar.com \
|
|
-e SMTP_PASSWORD=XXXXXXXX \
|
|
-e SERVER_HOSTNAME=helpdesk.mycompany.com \
|
|
juanluisbaptiste/postfix
|
|
|
|
If you are going to use this container from other docker containers then it's better to just publish the port:
|
|
|
|
docker run -d --name postfix -P \
|
|
-e SMTP_SERVER=smtp.bar.com \
|
|
-e SMTP_USERNAME=foo@bar.com \
|
|
-e SMTP_PASSWORD=XXXXXXXX \
|
|
-e SERVER_HOSTNAME=helpdesk.mycompany.com \
|
|
juanluisbaptiste/postfix
|
|
|
|
Or if you can start the service using the provided [docker-compose](https://github.com/juanluisbaptiste/docker-postfix/blob/master/docker-compose.yml) file for production use:
|
|
|
|
sudo docker-compose up -d
|
|
|
|
To see the email logs in real time:
|
|
|
|
docker logs -f postfix
|
|
|
|
#### A note about using gmail as a relay
|
|
|
|
Gmail by default [does not allow email clients that don't use OAUTH 2](http://googleonlinesecurity.blogspot.co.uk/2014/04/new-security-measures-will-affect-older.html)
|
|
for authentication (like Thunderbird or Outlook). First you need to enable access to "Less secure apps" on your
|
|
[google settings](https://www.google.com/settings/security/lesssecureapps).
|
|
|
|
Also take into account that email `From:` header will contain the email address of the account being used to
|
|
authenticate against the Gmail SMTP server(SMTP_USERNAME), the one on the email will be ignored by Gmail unless you [add it as an alias](https://support.google.com/mail/answer/22370).
|
|
|
|
|
|
### Debugging
|
|
If you need troubleshooting the container you can set the environment variable _DEBUG=yes_ for a more verbose output.
|