Fedora keeps sendmail — for now

> you're making an arbitrary and false distinction. any script that sends mail is a (primitive) MUA - pretty graphics or even an ncurses interface are not required.

The difference is that the MUA is the program the *user* invokes when they want to send mail.

MTAs can work nicely for fully automated mail (when configured appropriately on a network that supports them). Not every user wants or needs fully automated mails sent on their behalf; in particular,

To put it bluntly: I don't *want* sendmail to work on my system, because then programs might go around thinking they get to send mail without my involvement. You're arguing as though every single system has a pile of programs with a legitimate reason to send mail, which might have been true on UNIX systems of yore, but is no longer true on a modern Linux system.

In any case, I'm not going to spend time arguing the merits of modern mail clients. MTAs have a target audience of mail server administrators. MUAs have a far broader target audience, and the authors of modern MUAs spend far more time on UX and ease of use. If you believe that both are equally easy to configure, I have no interest in trying to convincing you otherwise.