So I’m currently running this docker image: https://github.com/Snawoot/postfix-mta-sts-resolver
It’s working great, though I noticed this morning that I had not started the image until after a reboot.
Basically, it checks whether a domain has implemented MTA-STS and uses a postfix tls transport to verify. It works great in all honesty, and I would suggest being added as a mailcow docker pull.
There is no reporting that I’m aware of, so if the devs want to help out, I’m sure it would be appreciated by the developer.
If anyone is wondering, it’s a pretty simple install.
- git clone and create storage
- add “smtp_tls_policy_maps = socketmap:inet:$HOST:8461:postfix” to extra.cf
- start up docker image and add to mailcowdockerized_mailcow-network
- restart postfix-mailcow image