New post on how to filter out email using GNU Mailutils sieve command. It's great for organising email so that you can focus on the important ones!
Sieve's actually a standard. I thought you had to run a full Dovecot IMAP server to use it - overkill for filtering email! Turns out that Mailutils has a command line Sieve that can run after mbsync!
https://www.futurile.net/2025/06/07/neomutt-mailutils-sieve/
Also, a detailed page on Sieve: