經常有這樣一類的郵件被退回
Reporting-MTA: dns; central.cis.upenn.edu
Received-From-MTA: DNS; [129.66.1.202]
Arrival-Date: Fri, 2 Apr 2004 07:58:05 -0500 (EST)
Final-Recipient: RFC822; labov@central.cis.upenn.edu
X-Actual-Recipient: RFC822; labov@earthlink.net
Action: failed
Status: 5.0.0
Remote-MTA: DNS; mxb.earthlink.net
Diagnostic-Code: SMTP; 554 Message Rejected Due To Virus Found In Attachment
Last-Attempt-Date: Fri, 2 Apr 2004 07:58:09 -0500 (EST)