252.rev.zs64.net has no MX records.
Question and response
Question
dig 252.rev.zs64.net. MX
Answer
The response has no answer records.
Authority
zs64.net. 1800 SOA ns1.hanse.de. hostmaster.hanse.de. 2026022800 1800 600 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0