mfg.onr.siteprotect.com has no MX records.
Question and response
Question
dig mfg.onr.siteprotect.com. MX
Answer
The response has no answer records.
Authority
mfg.onr.siteprotect.com. 300 SOA a.dns.hostway.net. hostmaster.siteprotect.com. 2008012006 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0