244.192-26.110.58.217.in-addr.arpa has no MX records.
Question and response
Question
dig 244.192-26.110.58.217.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
58.217.in-addr.arpa. 43200 SOA dnsti.interbusiness.it. staffdns.telecomitalia.it. 2015102522 28800 2880 1814400 86400
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0