We pick e.root-servers.net, one of the 13 root servers (1), and ask it about nic.sm and learn that sm is delegated to four name servers (2), so we ask dns.omniway.sm and get the following answer:
The three mail servers smtp20, smtp21 and smtp22.telecomitalia.sm together
There are more than hundred domains that use mail server group 1.
Most of those use name server group 1 (example: elettronicasammarinese.sm, disac.sm and automobileclub.sm ). Worth noting is that a third of the domains that use name server group 1 use mail server group 1.
Seven of them point only to the IP number 151.1.33.15.
The two name servers dns.intelcom.sm and dns.omniway.sm together
There are several hundred of domains that use name server group 1.
A third of those use mail server group 1 (example: romagnafurs.sm, rial.sm and sanmarinocard.sm ). Worth noting is that most of the domains that use mail server group 1 use name server group 1.
Four percent of them point only to the IP number 194.183.88.16.
Eleven of them point only to the IP number 151.1.33.15.
Nine of them point only to the IP number 62.149.197.228.