hostbill.nettigritty.com has no MX records.
Question and response
Question
dig hostbill.nettigritty.com. MX
Answer
The response has no answer records.
Authority
nettigritty.com. 300 SOA dns1.nettigritty.com. nettigritty.nettigritty.com. 2025110701 3600 7200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0