mail-in2a.server.iphh.net has no CNAME records.
Question and response
Question
dig mail-in2a.server.iphh.net. NS
Answer
The response has no answer records.
Authority
iphh.net. 3399 SOA ns1.iphh.de. hostmaster.iphh.net. 2026030403 43200 7200 2419200 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0