us2.smtp.exclaimer.net has no MX records.
Question and response
Question
dig us2.smtp.exclaimer.net. MX
Answer
The response has no answer records.
Authority
exclaimer.net. 1800 SOA javon.ns.cloudflare.com. dns.cloudflare.com. 2397403671 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0