News for hackers. Stuff that matters.
Re:How to Find Which Company Sold Your Email to Spammers by coreyp_1 on Monday October 30, 2017 @11:10PM (#15590854)
except that modern spammers know this trick, too, and just sanitize the email address before they send the email.
Re:How to Find Which Company Sold Your Email to Spammers by DrScump on Tuesday October 31, 2017 @12:25AM (#15591075)
Most don't seem to bother.

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.