host7.gateway.mazda.com has no MX records.
Question and response
Question
dig host7.gateway.mazda.com. MX
Answer
The response has no answer records.
Authority
mazda.com. 300 SOA rx7.mazda.co.jp. webmaster.is.mazda.co.jp. 2026011301 1800 100 1814400 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0