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How to Find Which Company Sold Your Email to Spammers (marvinrussell.com)
1 points by marvinrussell 3159 days ago
1 comments

except that modern spammers know this trick, too, and just sanitize the email address before they send the email.
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.