Poking at modly duties, see a sketchy-looking new user post along the lines of "I was shopping for [thing] and saw this at [site], should I get it or look into something else?"

Check the user's profile, see his email address is "outreach@[that site]."

Good job, buddy!

Half tempted to contact the site just to berate them not for the spamming but for being so completely halfassed about it.