149.226.185.in-addr.arpa has no MX records.
Question and response
Question
dig 149.226.185.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
149.226.185.in-addr.arpa. 86400 SOA dns10.copyleft.no. hostmaster.copyleft.no. 3000010679 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0