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Stalwart seems to be Rusty, while this one is Gooey.

Haven't used Mox yet but Chasquid is great if you want something that's focused on being a streamlined modern MTA rather than "all-in-one". So kind of the opposite of the Mox approach.

I like Chasquid for its straightforward codebase and the hook system that you can use to customize it further.

I've compared iRedMail, Mail-in-a-box, Mailcow, Modoboa, in 2021, if that helps (its in Russian)

https://www.linux.org.ru/forum/general/16654099?cid=16658164

I'm not really interested in these setups that combine postfix, dovecot, opendkim etc. Those aren't what I consider modern all-in-one email servers.

Stalwart seems to be more ahead feature-wise. As a Stalwart user I will definitely keep an eye on this project. Just a couple of missing features that are a dealbreaker. One of them is also absent in Stalwart - aliases to external accounts.