Returned mail: Service unavailable

The original message was received at Thu, 25 Aug 2005 07:04:10 -0400 (EDT)
from host146-240.pool8023.interbusiness.it [80.23.240.146]

*** ATTENTION ***

Your e-mail is being returned to you because there was a problem with its
delivery. The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors -----".

The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".

The line beginning with "<<<" describes the specific reason your e-mail could
not be delivered. The next line contains a second error message which is a
general translation for other e-mail servers.

Please direct further questions regarding this message to your e-mail
administrator.

--AOL Postmaster

   ----- The following addresses had permanent fatal errors -----
<rtclarke1_at_aol.com>

   ----- Transcript of session follows -----
... while talking to air-xi03.mail.aol.com.:
>>> DATA
<<< 554 TRANSACTION FAILED - Unrepairable Virus Detected. Your mail has not been sent.
554 <rtclarke1_at_aol.com>... Service unavailable