SOA
Start of Authority
Primary NS
Mailbox
postmaster.example.org
Serial
1789017147
Refresh
3600
Retry
600
Expire
86400
Minimum TTL
3600
NS
Nameservers
MX
Mail Exchangers
TXT
TXT Records
v=spf1 include:_spf.google.com include:_spf.conoha.ne.jp include:spf.mta.hdems.com ~all
A