mx100.012.net.il has no CNAME records.
Question and response
Question
dig mx100.012.net.il. NS
Answer
The response has no answer records.
Authority
012.net.il. 300 SOA pdns.goldenlines.net.il. postmaster.goldenlines.net.il. 2026021801 28800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0