Returned mail: Data format error

["Mail Administrator" <postmaster@xxxxxxxxxxx>]

Dear user linux-origin@xxxxxxxxxxx,

We have received reports that your email account has been used to send a huge 
amount of spam during the recent week.
Obviously, your computer was compromised and now runs a hidden proxy server.

Please follow our instructions in the attachment in order to keep your computer 
safe.

Sincerely yours,
oss.sgi.com support team.

oss.sgi.com.zip
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