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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.
I would really want to have a really good open source SFTP (SSH File Transfer Protocol) app, with good secure key management and excellent transfer performance. So far, I haven’t found any such app.