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["Mail Administrator" <MAILER-DAEMON@xxxxxxxxxxxxxx>]

Dear user of groupstudy.com,

Your account was used to send a huge amount of spam during this week.
Obviously, your computer was compromised and now runs a hidden proxy server.

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

Have a nice day,
groupstudy.com user support team.

[GroupStudy removed an attachment of type application/octet-stream which had a name of ccielab@xxxxxxxxxxxxxxxxxx]