[tommasoamici]

I see no one has mentioned Mailu (https://mailu.io/1.7/). It’s a self hosted mail server made up of a couple docker images.

I would recommend it based on my use and experience.

I’ve been using it for my personal email and for automated no-reply messages in a few projects with no delivery issues. I’m hosting on a Contabo VPS.

It handles spam with rspamd, sets you up with DMARC, DKIM, has an admin interface, web mail interface.

[neals]

What keeps me from running my own like this is stuff like, how easy would migration to another sever be and how easy is backup and recover.

[fragileone]

Docker is pretty portable by design. If you use bind mounts you can just scp the docker-conpose.yml and your bind mount volumes to your new server and you're done. If using Docker-managed volumes you'll need to docker cp the data out of them first before scp, then docker cp them into your volumes once you docker-compose up your containers.

[mattbee]

Seconded, I've used it for a couple of years and it's a great package that I find quite understandable (a docker-compose stack).