My last company would do this, and yeah, I think I got bit at least once.
THEN, without any clue about the irony, they'd send us "important" emails with something to click in them... employee surveys, links to benefits information, etc.
This must have been pointed out by other people than me, because once one of the emails had a line like, "AND YOU CAN CLICK ON THIS LINK, IT'S AUTHORIZED."
I don't miss working there (though I do miss a lot of the people).