return0.emarsys.net has no MX records.
Question and response
Question
dig return0.emarsys.net. MX
Answer
The response has no answer records.
Authority
emarsys.net. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009040439 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0