relay-eu.azotel.com has no MX records.
Question and response
Question
dig relay-eu.azotel.com. MX
Answer
The response has no answer records.
Authority
azotel.com. 600 SOA pdns03.domaincontrol.com. dns.jomax.net. 2026021800 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0