Some quotes from the book "Run Your Own Mail Server" by @mwl:
> Some users still like POP3, but even in the 1990s we knew it needed replacing and development on POP4 stopped in 2004 when the superior IMAP took over so don't permit anyone to persuade you to deploy it no matter how many e's they stick in neeeeded.
> Dovecot provides IMAP letting clients access their messages. It also supports POP3, but that's decades obsolete and if anyone demands it tell them it's time to free their PalmPilot.