I'm in the middle of setting up a docker mailserver for this purpose. There's a ton of levers to pull on that thing, but I'm getting thru it. The main thing is to get an account elsewhere that I can do SMTP or IMAP or pop3. Like many others point out, you don't want to create a mail server. What I do want is fetchmail accessible from all my devices that takes emails from any source and keeps them under my control...because it's my mail.