mailgate.leaseweb.net has no CNAME records.
Question and response
Question
dig mailgate.leaseweb.net. NS
Answer
The response has no answer records.
Authority
leaseweb.net. 3600 SOA ns0.leaseweb.com. postmaster.leaseweb.com. 2026022700 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0