mail.postimessaging.net has no CNAME records.
Question and response
Question
dig mail.postimessaging.net. NS
Answer
The response has no answer records.
Authority
postimessaging.net. 10800 SOA namesurfer.inet.fi. hostmaster.telia.fi. 2025092315 28800 7200 3456000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0