Linux.com: Process Your Email with Procmail

“Mutt is a fine command-line email client, but it lags Evolution
and Thunderbird in its ability to do email filtering. The procmail
mail processing utility can help. It is highly configurable, allows
for far better email filtering than Thunderbird, and as is
customary with command-line applications, it is fast. While
procmail is most commonly employed on the server side, its ability
to handle POP and IMAP protocols makes it useful for desktop users
as well.

“Procmail is a Mail Delivery Agent (MDA), meaning it can be used
along with a Mail Transfer Agent (MTA) such as mutt or sendmail to
filter messages…”