bit.do.			30 IN SOA mail.inmailing.com.br. root.localhost. (
				2022092309 ; serial
				14400      ; refresh (4 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				3600       ; minimum (1 hour)
				)

bit.do.			30 IN A	23.21.31.78

Name servers:
bit.do.			30 IN NS mail.inmailing.com.br.
bit.do.			30 IN NS mail2.inmailing.com.br.