You need to lookup the mail exchanger(s) for the domain. Try the following
Code:
host -t MX sarel.co.il
You should get something like
Code:
root@kenny:~# host -t MX sarel.co.il
sarel.co.il. mail is handled by 10 mail.sarel.co.il.
sarel.co.il. mail is handled by 100 mx10.netvision.net.il.
sarel.co.il. mail is handled by 1000 nypop.elron.net.
HTH
Jamie...