Comment by 0xbadcafebee

Subdomain addressing really is a killer feature. Since developers are braindead and can't implement a valid email address parser to save their lives, 'foo+bar@mydomain.com', 'foo-bar@mydomain.com', and 'foo.bar@mydomain.com' often get rejected as "invalid email addresses". But 'foo@bar.mydomain.com' always works fine.

Fastmail's Gmail integration to injest mails and calendars works fantastically. I've only had the calendar integration fail once, and was easily able to reconnect it. And iirc, you can even send mail through Gmail from Fastmail, so you can use Fastmail as an interface for both systems.

Up until recently my biggest gripe was the lack of offline mail, but finally both the web app and mobile app have offline now. The UI is still a teeny bit clunky (the whole email view reloads itself, even in the mobile app, for no reason), but I barely notice it. It's very stable, fast, reliable, and simple. I even use the 'file storage' feature as a replacement for GDrive sharing the occasional file.

One thing you don't realize when you leave Gmail is just how much crap you've signed up to over the years. I haven't used my Gmail for several years now but it still gets mail. (I'm keeping the account active so nobody else takes it and uses it for a weird attack)