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Should I move to Docker?
(lemmy.ca)
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this post was submitted on 13 Dec 2023
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Docker is nice for things that have complex installations and I want a very specific implementation that I don't plan to tweak very much. Otherwise, it's more hassle than it's worth. There are lots of networking issues like limited/experimental support for IPv6, and too much is hidden and preconfigured, making it difficult to make adjustments that would otherwise just be a config file change.
So it is good for products like a mail server where you want to use the exact software they use like let's say postfix + dovecot + roundcube + nginix + acme + MySQL + spam assassin + amavisd, etc. But you want to use an existing reverse proxy and cert it setup, or want to use a different spam filter or database and it becomes a huge hassle.
I haven't had any issues with IPv6. If you want to, you can just use a macvlan network and rely on SLAAC. I manually assigned ULA addresses to some containers and it's working well.
Also as a side note, it's not common for mail servers to use SpamAssassin any more. Most have moved to rspamd which is more powerful and much more efficient.
Can you recommend a mail server docker image like that? I have a hand cranked iredmail server that I've been babying for 5 years but I want to move it to either docker or an LXC.
I use Mailcow and like it a lot.
I use a mail service (MXRoute) as an outbound SMTP relay though, since I don't want to have to deal with deliverability, especially to picky services like Microsoft Hotmail/Outlook. It's a trade off. Other relays like SMTP2Go and Amazon SES work well too.
So I'm self-hosting the mailboxes, but when I send mail through my server, it sends them via MXRoute.
https://github.com/docker-mailserver/docker-mailserver
Mailcow or Mailu have pretty good setups if you don't want to do anything too different and don't need to keep resource usage to a minimum.