We pick c.root-servers.net, one of the 13 root servers (1), and ask it about sah1.ye and learn that ye is delegated to four name servers (2), so we ask ns2.yemen.net.ye where we learn that sah1.ye is delegated to two name servers, including sah1.ye (3), so we ask that one 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: eoisanaa.com.ye, sabanews.gov.ye and saberhospital.com.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: japanembassy.gov.ye, ymd.com.ye and ysrf.org.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.