Modified from catatnight/postfix to add virtualhost support
run postfix with smtp authentication (sasldb) in a docker container. TLS and OpenDKIM support are optional.
- Docker 1.0
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Build image
$ sudo docker pull benxo/postfix
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Create postfix container with smtp authentication
$ sudo docker run -p 25:25 \ -e mailhostname=mail.example.com -e maildomain=example.com -e smtp_user=user:pwd \ --name postfix -d benxo/postfix # Set multiple user credentials: -e smtp_user=user1:pwd1,user2:pwd2,...,userN:pwdN -
Enable OpenDKIM: save your domain key
.privatein/path/to/domainkeys$ sudo docker run -p 25:25 \ -e mailhostname=mail.example.com -e maildomain=example.com -e smtp_user=user:pwd \ -v /path/to/domainkeys:/etc/opendkim/domainkeys \ --name postfix -d benxo/postfix
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Enable TLS(587): save your SSL certificates
.keyand.crtto/path/to/certs$ sudo docker run -p 587:587 \ -e mailhostname=mail.example.com -e maildomain=example.com -e smtp_user=user:pwd \ -v /path/to/certs:/etc/postfix/certs \ --name postfix -d benxo/postfix
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Full example (where you have symlinked certs from letsencrypt into /etc/postfix/certs):
docker run -p 25:25 -p 587:587 \ -e mailhostname=mail.example.com -e maildomain=example.com -e smtp_user=user:pwd \ -e virtual_domains="mail.example.com test.example.com etc.example.com" \ -v /path/to/domainkeys:/etc/opendkim/domainkeys \ -v /etc/postfix/virtual:/etc/postfix/virtual \ -v /etc/letsencrypt/live:/etc/letsencrypt/live \ -v /etc/letsencrypt/archive:/etc/letsencrypt/archive \ -v /etc/postfix/certs:/etc/postfix/certs \ --name postfix -d benxo/postfix
- Login credential should be set to (
username@mail.example.com,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
- If you want a persistent queue between restarts, you will need to extract an empty spool from /var/spool/postfix inside the container, preserving IDs and permissions! One is provided in postfix-spool.tgz