I never sent mail to eq-4p@xr_haig.roup.com .But in my queue,i get is message.
Please tell me why and how to resolv this problem.Sender:mailer-daemon
From host: undefined
From domain: undefined
From IP: undefined
To domain: xr_haig.roup.com
Content filter: undefined
Reason:host or domain name not found.name service error for name=xr_haig.roup.com type=mx:host not found,try again