For the next two weeks, readers are submitting their best life hack for a chance to win an autographed copy of our new book, Upgrade Your Life. If you own a domain name with an active catch-all email address, you know how spammers can pummel you with junk mail to every anyword@yourdomain.com email address they can automatically generate. When you have your own domain, you can to use site-specific addresses when you register for web services to track down spam sources (like amazon.com@yourdomain.com), but once you do that, you’ve got to keep your catch-all address open to junk mail as well. But Google Apps user Ray has a clever system that filters out catch-all junk but still lets him track exactly who’s selling out his address. Here’s how to set it up.