Damn, Ben, how was your vacation on Mars for the past two weeks?
A new Sobig variant ("F") hit the Internet a few weeks ago, not long after the Blaster fiasco. Iggiebee pretty much has the story. You might also read here:
http://securityresponse.symantec.com...obig.f@mm.html
The worm is set to deactivate Sept 10th, so those annoying spoofed Emails will be gone within a week.
I'm amazed it just started bothering you now - I've been getting infected Emails and illegitimate bouncebacks/rejected Emails at a rate of about ten a day since the virus was released.
Alchemy