I don’t know what I would do without sieve, I use it to manage my mailing list subscriptions, eg move to folders, mark emails from specific chatty users as read

I don’t know what I would do without sieve, I use it to manage my mailing list subscriptions, eg move to folders, mark emails from specific chatty users as read, etc. It automates a lot of manual cruft and I’m endlessly thankful for it. I do wish it was more widely supported, and I try to do my part to encourage adoption (I maintain several sieve related packages for Arch Linux).