smp02.mailmerc.com has no MX records.
Question and response
Question
dig smp02.mailmerc.com. MX
Answer
The response has no answer records.
Authority
mailmerc.com. 300 SOA ns1.protected.ca. hostmaster.protected.ca. 2024081523 3600 900 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0