88.149.in-addr.arpa has no MX records.
Question and response
Question
dig 88.149.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
88.149.in-addr.arpa. 43200 SOA auth1.dns.cogentco.com. dns.cogentco.com. 2023112800 10800 3600 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0