- Another step up in security: ProtonMail can still read unencrypted incoming email. With self-hosting, you only have to trust your hosting provider. - Better

- Another step up in security: ProtonMail can still read unencrypted incoming email. With self-hosting, you only have to trust your hosting provider. - Better IMAP support: ProtonMail doesn't support IMAP without the ProtonMail bridge. The ProtonMail bridge was very buggy for me, and I have to self-host it anyways. With self-hosted email, I can just use IMAP normally (yay). - Better email search: With ProtonMail you can search for keywords in the message body but it doesn't work if you have lots of mail. With self-hosting you can search however you like across as much mail as you like. - Easier backups: On my self-hosted setup I can configure automated periodic backups. I don't think that's possible on ProtonMail. - Cost: ProtonMail is really expensive :( The main reason I switched was the IMAP part. I just got tired of the bridge bugs.