relay22.mailserve.net has no CNAME records.
Question and response
Question
dig relay22.mailserve.net. NS
Answer
The response has no answer records.
Authority
mailserve.net. 220 SOA qlcomm.com. sharad.qlcomm.com. 2009013009 1800 900 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0