[aboardRat4]

>use any number of clients to access your email.

Your car can have any colour, as long as it is black.

All native email clients are stuck in 2005, lack most basic features, and have bugs not fixed in decades. Also, most providers have poor support for new IMAP features, such as NOTIFY.

[alsetmusic]

I loved Mimestream when I worked at a place that was on Google.

https://mimestream.com/

[ymolodtsov]

But Mimestream is good specifically because it uses Gmail Sync API, not IMAP/SMTP.

[aboardRat4]

50 dollars for an app on an OS which I don't use, when Telegram is free and works everywhere?

[MarsIronPI]

Name one feature (i.e. thing that requires client support, not UI) that's new in email since 2005 and that's also worth having.

[aboardRat4]

Without IMAP NOTIFY email is almost unusable.

https://www.rfc-editor.org/rfc/rfc5465.html

It's from 2009.

Without managesieve (2010, https://www.rfc-editor.org/info/rfc5804/ ), any decent filtering is impossible. (And no, it's not supported by almost any email client)

JMAP has already been mentioned.

I also don't remember any email clients supporting carddav.

>not UI

Why not UI? UI is very important. Even such a basic thing as muting folders works like cr*ap in k9mail. Is it better in "fairemail"?

[bigfatkitten]

JMAP.

Modern authentication.

S/MIME with cryptography that isn’t RSA.