ns2.dattaweb.com has no MX records.
Question and response
Question
dig ns2.dattaweb.com. MX
Answer
The response has no answer records.
Authority
dattaweb.com. 14400 SOA ns3.hostmar.com. root.hostmar.com. 2026022238 28800 7200 2000000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0