32.29.217.in-addr.arpa has no MX records.
Question and response
Question
dig 32.29.217.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
32.29.217.in-addr.arpa. 3600 SOA nameserver1.pluspunkthosting.de. hostmaster.punkt.de. 2025051900 21600 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0