Comment by commandersaki

(1) tech support that actually reads your messages and replies with a solution demonstrating comprehension of the message that you wrote. Amazing. I've emailed them twice and gotten a great response both times.

Tech support forwarded an inquiry I was asking about an IMAP command in my MUA which led to an actual engineer that said my MUA was using an outdated/deprecated part of the IMAP protocol and provided the RFC for the new way of doing things, which then lead to a patch in said MUA. Very few companies offer this calibre of support, the only other one I can think of is Tarsnap.

(2) it is the best UI I've seen outside gmail

I think it's a much better UI overall than gmail; at least I found with gmail you had to manually paginate things, I can easily do a search in FM that might have 10000 emails over 20 years and I can usually jump to a specific month/year very quickly via scroll and then from there a specific day.

(5) Instead of inbox 0, I practice inbox 50k and it handles it fine.

Similar, 37k in my Inbox, nay issue. I have probably 200k overall across different folders. But I know I'm outsourcing a service, so I do full infrequent backups via IMAP.

Here's my (7):

Fastmail has the only web interface I've come across that handles (catch-all) aliases correctly and knows how to respond with the correct one every single time. Maybe roundcube/squirrelmail can do this, but roundcube/squirrelmail overall is not very good.