canon.com has no MX records.
Question and response
Question
dig canon.com. MX
Answer
The response has no answer records.
Authority
canon.com. 3600 SOA 01.dnsv.jp. hostmaster.dnsv.jp. 1772085991 86400 900 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0