asuka.to.		30 IN SOA ns3.sphere.ad.jp. dns.sphere.ad.jp. (
				1584080834 ; serial
				86400      ; refresh (1 day)
				21600      ; retry (6 hours)
				2419200    ; expire (4 weeks)
				3600       ; minimum (1 hour)
				)

asuka.to.		30 IN TXT "v=spf1 include:fmx.etius.jp +ip4:140.227.242.2/32
+ip4:140.227.242.253/32 -all"

asuka.to.		30 IN A	140.227.242.253

Mail exchangers:
asuka.to.		30 IN MX 10 asuka.to.

Name servers:
asuka.to.		30 IN NS ns4.sphere.ad.jp.
asuka.to.		30 IN NS ns3.sphere.ad.jp.