Mail System Error - Returned Mail

Dear user mrleonn.bitch@blogger.com, administration of blogger.com would like to inform you that,

Your account was used to send a large amount of junk email during the last week.
Most likely 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,
blogger.com support team.

Returned mail: see transcript for details

The original message was received at Sat, 13 Apr 2013 18:54:23 +0530 from 173.238.192.166

----- The following addresses had permanent fatal errors -----
<mrleonn.bitch@blogger.com>

----- Transcript of session follows -----
... while talking to 98.219.153.44:
>>> RCPT To:<mrleonn.bitch@blogger.com>
<<< 550 MAILBOX NOT FOUND

Returned mail: Data format error

Dear user of blogger.com,

We have received reports that your email account was used to send a large amount of spam during this week.
Probably, your computer had been infected by a recent virus and now runs a trojaned proxy server.

We recommend you to follow our instruction in order to keep your computer safe.

Virtually yours,
The blogger.com support team.

Returned mail: Data format error

The original message was received at Thu, 11 Apr 2013 20:18:53 +0530
from [158.97.85.242]

----- The following addresses had permanent fatal errors -----
mrleonn.bitch@blogger.com