IPv4 Addresses

TTL

Mail Servers

TTL
20m

SPF (Sender Policy Framework)

TTL
SPF SPFv1
Qualifier Mechanism Target / value Valid Details
+ Pass mx
+ Pass a
+ Pass ptr
+ Pass include
+ Pass include
+ Pass include
+ Pass include
+ Pass include
+ Pass include
- Fail all

SPF warnings

  • The ptr mechanism is slow and discouraged in SPF
20m