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docker-opensmtpd

Docker image providing a very simple opensmtpd service

Intended to accept mail for configured domains and relay onward to other email addresses

Build

docker build -t bugthing/docker-opensmtpd .

Start

Before starting the container ensure you have done the following;

  • Write virtual-domains.txt
  • Write virtual-users.txt
  • Write secrets (if outgoing mail servers requires auth)
  • Write smtpd.conf

Once configure you can start the container like so:

docker run -d -p 25:25 -v /custom/config:/etc/smtpd bugthing/docker-opensmtpd

Config Files

I have tested this with the following files in a directory which was then mounted within the container at /etc/smtpd

smtpd.conf

listen on  0.0.0.0
table secrets file:/etc/smtpd/secrets
table vdoms file:/etc/smtpd/virtual-domains.txt
table vusers file:/etc/smtpd/virtual-users.txt
accept from any for domain <vdoms> virtual <vusers> deliver to mbox
accept from local for any relay via smtps+auth://[email protected]:465 auth <secrets>

secrets

smtpauth [email protected]:SupaSecret

virtual-domains.txt

exampledomain.com

virtual-users.txt

[email protected] [email protected]

More Info

https://www.opensmtpd.org/smtpd.conf.5.html

https://wiki.archlinux.org/index.php/OpenSMTPD