postfix

run postfix with smtp authentication (sasldb) in a docker container. TLS, OpenDKIM and Certbot (Cloudflare) support are optional.

Usage

1. Create postfix container with smtp authentication

   $ sudo docker run -p 25:25 \
   		-e maildomain=mail.example.com -e smtp_user=user:pwd \
   		--name postfix -d jeansf/postfix
   # Set multiple user credentials: -e smtp_user=user1:pwd1,user2:pwd2,...,userN:pwdN

2. Enable OpenDKIM: save your domain key mail.exmple.com.private in /path/to/domainkeys

   $ sudo docker run -p 25:25 \
   		-e maildomain=mail.example.com -e smtp_user=user:pwd \
   		-v /path/to/domainkeys:/etc/opendkim/domainkeys \
   		--name postfix -d jeansf/postfix

3. Enable TLS(587): save your SSL certificates live/mail.exmple.com/fullchain.pem and live/mail.exmple.com/privkey.pem to /path/to/certs like a letsencrypt structure

   $ sudo docker run -p 587:587 \
   		-e maildomain=mail.example.com -e smtp_user=user:pwd \
   		-e enable_tls=true
   		-v /path/to/certs:/etc/letsencrypt \
   		--name postfix -d jeansf/postfix

4. Enable TLS(587) with Certbot (Cloudflare): renew certificate enabled in this option

   $ sudo docker run -p 587:587 \
   		-e maildomain=mail.example.com -e smtp_user=user:pwd \
   		-e enable_tls=true -e cloudflare_api_token=TOKEN
   		-v /path/to/certs:/etc/letsencrypt \
   		--name postfix -d jeansf/postfix

Note

• Login credential should be set to ([email protected], password) in Smtp Client
• You can assign the port of MTA on the host machine to one other than 25 (postfix how-to)
• Read the reference below to find out how to generate domain keys and add public key to the domain's DNS records

Reference

• Postfix SASL Howto
• How To Install and Configure DKIM with Postfix on Debian Wheezy

Code Attribution

The code in this project is based on or includes code snippets from the following source:

• Original Project: catatnight/docker-postfix