postfix.emea.allegiance.com has no MX records.
Question and response
Question
dig postfix.emea.allegiance.com. MX
Answer
The response has no answer records.
Authority
allegiance.com. 600 SOA pdns05.domaincontrol.com. dns.jomax.net. 2025111001 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0