I do understand the need for a better modern open source email client (not trying to start any kind of client war here), but I really want something that doesn'

I do understand the need for a better modern open source email client (not trying to start any kind of client war here), but I really want something that doesn't rely on an external server. 1 - any suggestions for an open source alternative that provides email snoozing on linux (that's a big part of my email processing)? 2 - any good guide on how to self host the Nylas server on my home server (I know they have the project on GitHub but the instructions are a bit too complicated for me, although that's perhaps my sysadmin skills are quite low)?