It's a virus, most likely MyDoom-o
http://www.sophos.com/virusinfo/anal...32mydoomo.html#
Quote:
The email sent by the worm has a spoofed sender.
The subject line may be blank or one of the following:
hello
hi
error
status
test
report
delivery failed
Message could not be delivered
Mail System Error - Returned Mail
Delivery reports about your e-mail
Returned mail: see transcript for details
Returned mail: Data format error
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Quote:
The message text of the email is constructed from a set of optional strings within the worm. The message sent is blank or similar to one of the following messages:
Dear user of <domain>
Mail server administrator of <domain> would like to inform you that
We have detected that your e-mail account has been used to send a large
amount of unsolicited e-mail messages during this recent week.
We suspect that your computer had been compromised by a recent virus and now
runs a trojan proxy server.
Please follow our instructions in the attachment file
in order to keep your computer safe.
Virtually yours
<domain> user support team.
The message could not be delivered
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