irtk.ru.		30 IN SOA v1.sibdc.ru. help.sibdc.ru. (
				2017011016 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

irtk.ru.		30 IN TXT "v=spf1 ip4:92.127.158.61 ip4:92.127.158.64 ip4:92.127.158.59
ip4:92.127.158.15 a mx ~all"

irtk.ru.		30 IN A	92.127.158.64

Mail exchangers:
irtk.ru.		30 IN MX 20 mail.irtk.ru.
irtk.ru.		30 IN MX 10 mail.irtk.ru.

Name servers:
irtk.ru.		30 IN NS ns4.sibdc.ru.
irtk.ru.		30 IN NS ns3.sibdc.ru.