Regarding the body of Mail delivery failed: returning message to sender

I have two servers, but body of Mail delivery failed: returning message to sender is different: First Server: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: www@domain.com host domain.com [IP address] SMTP error from remote mail server after RCPT TO:: 550 No such person at this address. Second Server: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: sss@domain.com No such person at this address. The body from second server is simple and without IP address, pls compare above underline content. I'd like the body from second server. I forgot how to work out it in WHM, anybody can offer any tips? Thanks, Ray