www.netaddress.com has no MX records.
Question and response
Question
dig www.netaddress.com. MX
Answer
The response has no answer records.
Authority
netaddress.com. 900 SOA cndvg001.usa.net. hostmaster.usa.net. 2026022401 600 600 604800 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0