this post was submitted on 11 Dec 2023
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I've been self-hosting email for 10+years. I can confirm it's a pain in the arse... Harder from a dynamic IP too (since you basically can't get any reputation, or you might get an IP that's banned for 'x' reasons)
Postfix + Dovecot here
Edit: Didn't really give you an opinion. It's doable if you have the time and patience. I work in IT too so I'm pretty good at troubleshooting etc. but sometimes it's a LOT of time fiddling and debugging.
I used postfix and dovecot as well.
Basically walked through Linuxbabe's excellent guide and was done in about 1.5 hours with SPF/DKIM/DMARC.
https://www.linuxbabe.com/mail-server/build-email-server-from-scratch-debian-postfix-smtp
I have my own domain and a static IP with one of Linode's nanode sizes servers for USD5 a month, works pretty good.
I use FreeBSD so used the guide here:
https://www.purplehat.org/?page_id=4
Sadly it is a little outdated and 1 step will fail right now until a new package is committed in to the FreeBSD repo (HTMLPurifier) which was removed as it was PHP7 only for a while. But yeah, have SPF, DKIM and DMARC running too. Took a little fiddling since I technically host for 2 domains but trial and error and all good now.
IMO the only truly difficult part of self hosting is mail delivery because you end up at the mercy of big stupid companies (eg Microsoft) that don't give a shit. It is possible and possibly advisable to use a paid service for delivery and let someone else deal with the bastards.
With a bit of research and a methodical approach I think just about anybody comfortable setting up other linux network services should be fine. I am very lazy and have been doing it for 2 decades. I like being in control of my own mail store. I choose to do my own delivery and the only persistently difficult provider is Microsoft's free email offerings which I care about about as much as they care about running a reliable mail system for their users. They seem to penalize infrequent low volume senders. I have always been signed up to their spam monitoring bullshit and have never had a negative report but they don't seem to communicate there so you can be blocked and nobody knows how or why. They blocked most of my hosting provider once so I routed my outgoing email with correct dkim, spf etc from a server hosted elsewhere. Easy to do with Postfix.
Yeah I found both Google and MS will arbitrarily act like dicks. Have it all sorted these days but still keeps me on my toes. Interestingly I can't email myself from my work email address because the MS mail service they use fails SPF checks...
All fun and games at the end of the day! :)