o5.ptr3260.adversus-mail.com has no CNAME records.
Question and response
Question
dig o5.ptr3260.adversus-mail.com. NS
Answer
The response has no answer records.
Authority
adversus-mail.com. 3600 SOA ns1.dlx.dk. ks.dlx.dk. 2025100901 14400 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0