mail15532.emails.markerstudy.com has no MX records.
Question and response
Question
dig mail15532.emails.markerstudy.com. MX
Answer
The response has no answer records.
Authority
emails.markerstudy.com. 3600 SOA ns1.namecity.com. hostmaster.namecity.com. 2025112700 43200 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0