Simple SMTP relay docker image.
Find a file
Juan Luis Baptiste 05e8163785 Fix link
2015-04-19 17:39:10 -05:00
etc/supervisord.d Postfix configuration file for supervisord. 2015-04-19 17:30:19 -05:00
README.md Fix link 2015-04-19 17:39:10 -05:00
run.sh First version 2015-04-19 17:30:41 -05:00

docker-postfix

Simple Postfix SMTP TLS relay docker image.

Build instructions

Clone this repo and then:

cd docker-Postfix
sudo docker build -t postfix .

You can also find a prebuilt docker image from Docker Hub, 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_USERNAME Username to authenticate with.
  • SMTP_PASSWORD Password of the SMTP user.

To use this container from anywhere, the port 25 needs to be exposed to the docker host server:

docker run --rm --name postfix -p "25:25" -e SMTP_SERVER=smtp.bar.com -e SMTP_USERNAME=foo@bar.com -e SMTP_PASSWORD=XXXXXXXX postfix

If you are going to use this container from other docker containers then it's better to just publish the port:

docker run --rm --name postfix -P -e SMTP_SERVER=smtp.bar.com -e SMTP_USERNAME=foo@bar.com -e SMTP_PASSWORD=XXXXXXXX postfix

A note about using gmail as a relay

Since last year, Gmail by default does not allow email clients that don't use OAUTH 2 for authentication (like Thunderbird or Outlook). First you need to enable access to "Less secure apps" on your google settings.

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.