Notifications not sent to one domain but sent to others?


We moved our mail server to a virtual machine. Nothing has changed, strictly P to V conversion. Ever since I can not receive emails from Nagios to my company email address. I can send/receive them elsewhere to other domains and addresses but not to our own local domain. Any thoughts? Should I look at our mail server (exchange '03) or is it a CentOS issue?

Thanks in advance.