@deepjoy
Yes, I participated in two projects funded by #NLnet
First, #CAcert (I was on the board from 2012 to 2016, most recently as Vice President). Then, from 2016 until its unfortunate discontinuation in 2022, I worked on the #WPIA project, again as Vice President and also as Managing Director.

I have to say that the email server actually requires the least work of all.
I use the #MailCow Suite @doncow , and a lot of it is already automated, and the individual components work together seamlessly.
My mail server "serves" almost the entire family network, as well as 4 small businesses and a handful of clubs. So, about 10 or 12 "main domains", and around 20 or 25 alias domains.

IP reputation hasn't worried me much either; I've only had one blacklisting issue in the last five years, but the hosting provider resolved it within a few hours. And of course, you have to ensure that #DKIM, #DMARC, #SPF etc. work together correctly. Then it becomes quite easy.
So I'd say things have gotten easier since I started #selfhosting e-Mail years ago. (#mDaemon was my first hosting suite for e-Mail).

Edit: I should also mention that I run an email setup with a primary mail server and a backup mail server.

@yunohost @nlnet