Delayed Mail (still being retried)

Hi
 i have CWP on one of my servers with the server name  pickthorn.serverrackone.info

now i am getting loads on the below system generated emails.  how can i stop them in CWP

This is the mail system at host pickthorn.serverrackone.info.

####################################################################
# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. # ####################################################################

Your message could not be delivered for more than 4 hour(s).
It will be retried until it is 5 day(s) old.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

                   The mail system

<support@easyhostmediagroup.co.uk> (expanded from <root>): host
    easyhostmediagroup.co.uk[208.117.38.89] said: 550-Verification failed for
    <root@pickthorn.serverrackone.info> 550-The mail server could not deliver
    mail to root@pickthorn.serverrackone.info.  The account or domain may not
    exist, they may be blacklisted, or missing the proper dns entries. 550
    Sender verify failed (in reply to RCPT TO command)

I have the same problem (CWP7)

root@pickthorn.serverrackone.info. email account doesn't exists.

Hi

 Yes because pickthorn.serverrackone.info is the server hostname, so wont have an email address