pm0.sba.impulse.net has no MX records.
Question and response
Question
dig pm0.sba.impulse.net. MX
Answer
The response has no answer records.
Authority
impulse.net. 1800 SOA jasmine.ns.cloudflare.com. dns.cloudflare.com. 2396605772 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0