mx1.netsolmail.net has no MX records.
Question and response
Question
dig mx1.netsolmail.net. MX
Answer
The response has no answer records.
Authority
netsolmail.net. 3600 SOA ns1.netsolmail.com. namehost.worldnic.com. 109012019 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0