SOA
Start of Authority
Primary NS
Mailbox
hostmaster.vietsci.com
Serial
2026012107
Refresh
14400
Retry
3600
Expire
1209600
Minimum TTL
86400
MX
Mail Exchangers
TXT
TXT Records
v=spf1 include:_spf.bizmac.com -all
v=spf1 include:spf.maychuemail.com ~all
A