One of the nice things about a fully-featured email filter (I'm using sieve on my own Dovecot installation but you wouldn't have to go that far) is making your own "bulk" mailbox. I have a sieve rule that's got maybe ten "or" conditionals in it, and does a darn good job of picking out mailing list/bulk emails and shunting them to their own box. I don't mind signing up for newsletters or letting merchants mail me so much, because I know those messages are all going to their own special home. I have an older-than-three-months autodelete on the mailbox, and manually move anything I want to keep (receipts, etc) into a "bulk-keep" mailbox, and that's it. Takes me seconds to scan each day, and doesn't pollute my inbox.
