dqecomm.mail.pairserver.com has no MX records.
Question and response
Question
dig dqecomm.mail.pairserver.com. MX
Answer
The response has no answer records.
Authority
pairserver.com. 3600 SOA ns1.pair.com. root.pair.com. 2026022619 3600 300 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0