sld.cu.			30 IN SOA ns1.sld.cu. adm.infomed.sld.cu. (
				2025032505 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1200       ; minimum (20 minutes)
				)

sld.cu.			30 IN TXT "v=spf1 a:spf.sld.cu -all"

Mail exchangers:
sld.cu.			30 IN MX 10 mx.sld.cu.

Name servers:
sld.cu.			30 IN NS ns2.sld.cu.
sld.cu.			30 IN NS ns1.sld.cu.
sld.cu.			30 IN NS ns3.sld.cu.