AOL are, I suspect, trying to scare BT/Yahoo users into changing to AOL. I've had lots of complaints (to the Flyer List) these past few days from BT users whose mail to AOL users is being bounced.
And I'm that "victim". My (former) primary e-mail address is being used by a spammer sending out advertising to Russians. I was getting thousands of bounces a day, till I disabled it. The primary source of the Spam was blueyonder, who claimed it's a virus on one user's machine.
Still don't know why it took them over three weeks to sort out that user! The spam goes on, from a different ISP now.