We pick c.root-servers.net, one of the 13 root servers (1), and ask it about sah2.ye and learn that ye is delegated to four name servers (2), so we ask ns1.yemen.net.ye and get the following answer:
The two mail servers sah1.ye and mx1.y.net.ye together
Most of the more than hundred domains that use mail server group 1 use name server group 2 (example: yemenbasketball.com.ye, ahkagroup.com.ye and yala.org.ye ). Worth noting is that two thirds of the domains that use name server group 2 use mail server group 1.
The two name servers sah1 and sah2.ye together
Two thirds of the more than hundred domains that use name server group 2 use mail server group 1 (example: toyota.com.ye, giay.gov.ye and dhl-exel.com.ye ). Worth noting is that most of the domains that use mail server group 1 use name server group 2.
The mail server mail.yemen.net.ye
There are more than hundred domains that use the mail server mail.yemen.net.ye.