o4.email.snapengage.com has no MX records.
Question and response
Question
dig o4.email.snapengage.com. MX
Answer
The response has no answer records.
Authority
snapengage.com. 1800 SOA carl.ns.cloudflare.com. dns.cloudflare.com. 2393931640 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0