Well you guys aren't alone, I'm getting the same thing. This is what I got from submitting a support ticket yesterday about the same issue:
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I have an account, www.xl7tv.com hosted with surpass hosting. At around 4:00pm CST, I noticed non-deliverable emails from various forwards and main accounts I have on xl7tv.com (which I did not send) with what looked like virus attacks. I don’t know if your full list of servers have been attacked or just my domain. Just thought I would let you know. Let me know if you need any more information.
Gil Reynolds
RE: Email Attack
If they had some reference to FormMail in them, its cause of this exploit going around from spammers, they have found a way to use it outside normal accounts. Were looking to get this fixed soon
Ron
The Tech Guru
AIM: DimeLiveRon
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I got close to around 300 emails this morning from spammers. I hope tech support fixes this issue.