I can't verify the veracity of the claim but, one person was nothing less than enraged that they missed just such an Email(s). I of course immediately turned off the feature upon seeing the notice. I had the the opportunity - and time. Apparently not all were so fortunate.
@Blue Ink: I suppose I see your point. I just question the wisdom of turning it on by default and, whether we need another place to tell users to look for their missing email. And, of course, I use spam filtering on MY on email system. The Outlook/Office365 required by my present client seems comparatively anaemic.