I have certainly violated this xkcd at this point...
A wrapper script around the Dovecot's doveadm backup
utility, that interactively downloads emails from another IMAP server.
Useful when the other server does not support master users. If it does, there's a much easier way - it's not needed to download mailboxes per-user and have them enter the password manually. But some really old IMAP servers have no idea of master users and that's why this script exists.