sjzedns001.navisite.net has no MX records.
Question and response
Question
dig sjzedns001.navisite.net. MX
Answer
The response has no answer records.
Authority
navisite.net. 10800 SOA minedns001.navisite.net. hostmaster.navisite.com. 2008036515 21600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0