MrCIn my day job, I'm constantly contacted by tech salespeople trying to sell me their new wiz-bangs (or wiz-bangs as a service).
Not once, but several times in recent months, I've gotten emails thanking me for attending a webinar (which I never signed up for or attended) and could they follow up?
This is worse the the "negging" lead generation software from a few years ago that would send you increasingly passive aggressive emails if you didn't respond.