returnpath.zivver.org has no CNAME records.
Question and response
Question
dig returnpath.zivver.org. NS
Answer
The response has no answer records.
Authority
zivver.org. 1234 SOA dora.ns.cloudflare.com. dns.cloudflare.com. 2395847621 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0