return.flowmailer.net has no CNAME records.
Question and response
Question
dig return.flowmailer.net. NS
Answer
The response has no answer records.
Authority
flowmailer.net. 299 SOA ns1.flowmailer.net. contact.flowmailer.net. 2026030602 3600 300 7200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0