About "Sender:mailer-daemon"

[minskycn]

I never sent mail to eq-4p@xr_haig.roup.com .But in my queue,i get is message.

Sender:mailer-daemon
From host: undefined
From domain: undefined
From IP: undefined
Recipients: eq-4p@xr_haig.roup.com
To domain: xr_haig.roup.com
Content filter: undefined
Size: 9312
Reason:host or domain name not found.name service error for name=xr_haig.roup.com type=mx:host not found,try again

Please tell me why and how to resolv this problem.
Thanks

[uxbod]

Check in /var/log/zimbra.log for that email address. Ensure that you are not allowing relaying aswell. You can also use

su - zimbra
zmmsgtrace -r eq-4p@xr_haig.roup.com

to trace it through Zimbra. Somebody may just have spoofed your domain aswell, so you are effectively getting the backscatter from it.