5.217.in-addr.arpa has no MX records.
Question and response
Question
dig 5.217.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
5.217.in-addr.arpa. 86400 SOA pns.dtag.de. dns.telekom.de. 2025020400 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0