Received the following email today. ATT has no apparent mechanism for reporting this to them, so I am posting a copy of it here to alert others.
"Dear AT&T Subscriber, =====================
A DGTFX Virus has been detected in your At&t.net folders. Your email account has to be upgraded to our new Secured DGTFX anti-virus 2011 version to prevent damages to our web mail log and to your important files. Click your reply tab, Fill the columns below and send back to us or your email account will be terminated to avoid spread of the virus.
Note that your password will be encrypted with 1024-bit RSA keys for your password safety.
All AT&T.net User Should Reply Now !!!
Failure to do this will immediately render your Web-email address deactivated from our database.