dns1.nettigritty.com has no MX records.
Question and response
Question
dig dns1.nettigritty.com. MX
Answer
The response has no answer records.
Authority
nettigritty.com. 300 SOA dns1.nettigritty.com. nettigritty.nettigritty.com. 2026011100 3600 7200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0