mail1.authore.com has no CNAME records.
Question and response
Question
dig mail1.authore.com. NS
Answer
The response has no answer records.
Authority
authore.com. 2448 SOA ns3.firstfind.nl. hostmaster.firstfind.nl. 2026030501 16384 2048 1048576 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0