columbia.nexlinx.net has no MX records.
Question and response
Question
dig columbia.nexlinx.net. MX
Answer
The response has no answer records.
Authority
nexlinx.net. 3600 SOA columbia.nexlinx.net. admin.nexlinx.net.pk. 35 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0