| None of them have good (or any) support for managesieve. Without managesieve (or some other autotagging mechanism), email is just a big pile of junk. Even Gmail doesn't support editing filters on the mobile app. It's ludicrous in 2026. And their filters are strictly weaker than Sieve. None of them have a feature to "quickly generate a filter rule from a message". None of them have a way to generate a forum-like interface from a mailing list more or less automatically. None of them (except deltachat, I think), support displaying messages linearly, one below another, rather than one at a time. One at a time is also important. When I'm writing to my boss, I am writing a message as if it is a document. But when I'm writing to my girlfriend, I often want it to a be a one-line response. Overquotting is badly managed. Gmail hides the previous message under a button, which is super slow, but most of the time overquotting is not even needed. There should be a button to "not quote" and "strip quotes automatically". |