Yes, it is.
I’ve been running my own mail server for decades now (a quite odd hobby, I know) and that’s not to be recommended for anyone who doesn’t have a particular interest in e-mail. SMTP is from the early 1980s with roots in the 1970s and has had layer upon layer bolted on since then. It’s a fantastic mess.
Guilty as charged. After reading the title it didn’t even cross my mind that it could possibly refer to anything other than mobile apps so I saw no reason whatsoever to look at what community it was posted in as the app I came to think of as a good recommendation is cross platform.