How to Find Which Company Sold Your Email to Spammers Posted by marvinrussell on Monday October 30, 2017 @10:10PM from the marvinrussell.com dept. http://marvinrussell.com/how-to-find-which-company-sold-your-email-to-spammers/ ( 2 comments | on HN )
The only problem I've had using this is that some sites have sloppy email address verification and assume that the plus sign should be disallowed.