"Getmail is a program for retrieving emails from remote servers;
it is very similar to fetchmail, but more flexible. For example, it
can be configured to deliver mails directly to a Maildir or mbox
mailbox without the need for an MTA such as Postfix, but of course
it can also pipe the mails through an MTA if you want. Getmail can
use so called filters such as SpamAssassin and ClamAV to scan the
mails, and you can even tell getmail to delete mails on the
original server only after a certain number of days..."