tropica.ru.		3600 IN	SOA afx.ru. root.example.com. (
				2018041411 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

tropica.ru.		3600 IN	TXT "v=spf1 ip4:212.8.247.23 a mx ~all"

tropica.ru.		3600 IN	A 212.8.247.23

Mail exchangers:
tropica.ru.		3600 IN	MX 20 mail.tropica.ru.
tropica.ru.		3600 IN	MX 10 mail.tropica.ru.

Name servers:
tropica.ru.		3600 IN	NS ns51.ruweb.net.
tropica.ru.		3600 IN	NS ns52.ruweb.net.