ru.cellcom.co.il has no MX records.
Question and response
Question
dig ru.cellcom.co.il. MX
Answer
The response has no answer records.
Authority
cellcom.co.il. 3600 SOA dns.netvision.net.il. hostmaster.netvision.net.il. 2026020501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0