smtp2.allweb.se has no CNAME records.
Question and response
Question
dig smtp2.allweb.se. NS
Answer
The response has no answer records.
Authority
allweb.se. 10800 SOA ns1.allweb.se. registry.allweb.se. 2025110905 10000 1800 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0