１ Sendgrid側
Setting→Sender Authentication
設定方法
マニュアル参照
2 ValueDomain側
a * 163.44.176.13
aaaa * 2400:8500:1301:162::13:1
mx @ 10
cname em6554.kouryumura.net u25836151.wl152.sendgrid.net.
cname s1._domainkey s1.domainkey.u25836151.wl152.sendgrid.net.
cname s2._domainkey s2.domainkey.u25836151.wl152.sendgrid.net.
cname url7886.kouryumura.net sendgrid.net.
cname 25836151.kouryumura.net sendgrid.net.
txt @ v=spf1 ip4:163.44.176.13 ip6:2400:8500:1301:162::13:1 ~all
