dockerized VS docker-mailserver

We still run multiple own mail servers for sending 100.000 transactional emails per month. For GDPR reasons and because we have existing contracts with our customers which name all our used IT suppliers, which we don't want to touch to add a new one. We started with iRedMail, now use mailu (fewer moving parts, IMHO).

Currently we do that with iRedMail in a Docker container, but it has a lot of moving parts (Postfix, Dovecot, Nginx, MySQL, Amavisd-new, SpamAssassin, ClamAV, RoundCube) that can potentially fail.

We use iRedMail in Docker as mail server, works for 250.000 transactional emails per month.

I can recommend Docker mailserver (it also works with Podman). It is already pretty lightweight but you can even make it lighter and it has an active community as well as regular updates.

https://github.com/docker-mailserver/docker-mailserver https://docker-mailserver.github.io/docker-mailserver/latest/ https://www.programonaut.com/how-to-host-a-mail-server-with-docker-for-free-step-by-step/

Use https://github.com/docker-mailserver/docker-mailserver or mailcow . They both provide reasonable default setup for spam detection and even UI for adjusting settings.

" this docker based mail server looks pretty legit https://github.com/docker-mailserver/docker-mailserver "

Check https://github.com/docker-mailserver/docker-mailserver It has almost everything in a single docker image. Email is not the easiest to implement with container(s), but that project has managed it.

I set up docker-mailserver[0] Monday in ~6 hours, most of which were me trying to be fancy using podman instead of docker and dealing with SELinux. But then again I did choose it over mail-in-a-box for just that level of customization. Obviously I can't tell how reliable it will be in the long run yet, but since it's using the classic Postfix/Dovecot stack I expect it'll be pretty stable

[0] https://github.com/docker-mailserver/docker-mailserver