SOA
Start of Authority
Primary NS
Mailbox
azuredns-hostmaster.microsoft.com
Serial
100203
Refresh
3600
Retry
300
Expire
100159
Minimum TTL
300
NS
Nameservers
MX
Mail Exchangers
TXT
TXT Records
v=spf1 include:spf.protection.outlook.com include:sendgrid.net ip4:185.81.4.137 -all
A