mx05.qos.net.il has no CNAME records.
Question and response
Question
dig mx05.qos.net.il. NS
Answer
The response has no answer records.
Authority
qos.net.il. 3449 SOA pdns.qos.net.il. sdns.qos.net.il. 2007091895 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0