Nowadays, I primarily only use gmail because the mail client is good on Android. But all my accounts have been self-hosted for years now and gmail just reads them via POP3 (never managed to get it happy with IMAP for some reason) and sends via my own SMTP.

Can anyone recommend actually decent and free Android (and also web) mail clients for self-hosted use? Everything I've tried so far (but to be fair, it was a few years ago when I last checked) just felt clunky compared to gmail, so I've ended up sticking with it as a client far longer than I probably should.