Savvy Gmail users know they can add a "+something" to the address they give out, then filter messages to that pseudo-address. But what if you're not using Gmail or the site doesn't accept "+" addresses? That's where this naming trick comes in.
Ed. note: This filter also works great as a companion to the mailing list and newsletter keyword filter we recently posted.
When signing up for some not-so-important web service that requires some kind of email registration, you probably don't want to read any further emails from this service again, especially when you're signing up just for one tiny bit of information, like a link visible just to site members.
Nowadays with a Gmail address, you would normally use [email protected] to sign up for xy-service, and afterwards filter out every mail addressed to:john.doe+xy.
Some services don't allow the plus in mail addresses, and some users don't use Gmail. But for them, there's this simple trick.
As long as you don't care about a strange surname/familyname listed in a web service's database, you can fill up the requested information fields with your name, plus some clever prefix or postfix, like "JohnFilter DoeFilter". Chances are good that the emails from the service contain at least one part of your name (Like "Dear Mr DoeFilter" or "Hello JohnFilter!") - and that's the point for your spamfilter to work on. Add a filter for "Has the words: JohnFilter," substituting your own NameFilter key, and you're on your way to never hearing from this one-shot web service again.
It's up to you, whether you create a different suffix for every service, or just one name for all the web services you don't care about. Either way, you've now got a way out for services that try to restrict your filter creativity.