webdelivery1.serverlet.com has no CNAME records.
Question and response
Question
dig webdelivery1.serverlet.com. NS
Answer
The response has no answer records.
Authority
serverlet.com. 3352 SOA ns1.serverlet.com. info.serverlet.com. 2026022394 10000 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0