This is one of my most disliked parts of the email model. I generally have an MTA running and IMAP server where I set rules such as blocking mailing list thread

This is one of my most disliked parts of the email model. I generally have an MTA running and IMAP server where I set rules such as blocking mailing list threads and use my MUAs as dumb clients to fetch from the IMAP server. Setting the rules on the MTA is a bit of a pain but it works and keeps my setup portable.