x07.i.ismtp.integra.net has no MX records.
Question and response
Question
dig x07.i.ismtp.integra.net. MX
Answer
The response has no answer records.
Authority
integra.net. 3600 SOA nsx.integraonline.com. itops.zayo.com. 2026012701 300 7200 604800 172800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0