web2v2.mail.ziggo.com has no CNAME records.
Question and response
Question
dig web2v2.mail.ziggo.com. NS
Answer
The response has no answer records.
Authority
mail.ziggo.com. 9 SOA ns1.flowmailer.net. contact.flowmailer.net. 2026021602 86400 7200 7200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0