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550 Invalid recipient

When a customer of ours sends an e-mail to anyone in our company the message gets bounced back to them say the following:

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <domain.co.uk #5.5.0 smtp;550 Invalid recipient: serverstatus@domain2.co.uk>

We can recieve e-mail from everyone else and they are having no known problems sending to anyone else apart from ourselves. The event logs show the following errors.
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A non-delivery report with a status code of 5.5.0 was generated for recipient rfc822;serverstatus@domain2.co.uk (Message-ID  <000101c72281$6d48c680$0120a8c0@domain.local>).  
Cause:  This message indicates a generic protocol error (SMTP error).  For example, the remote SMTP responds to an issued EHLO with a 500 level error and the sending system will QUIT the connection and report this with NDR indicating the remote SMTP server canÆt handle the protocol.    
Solution:  View the SMTP log or run a netmon trace to see why the remote SMTP server rejects the protocol request.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event ID : 3022
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This is an SMTP protocol error log for virtual server ID 1, connection #640. The remote host "62.231.32.13", responded to the SMTP command "rcpt" with "550 Invalid recipient: serverstatus@domain2.co.uk  ". The full command sent was "RCPT TO:<serverstatus@domain2.co.uk>  ".  This will probably cause the connection to fail.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event ID : 7004

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I have gone down all the usual routes and still none the wiser. Please help.






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Sembee
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