SPF checker

Validate SPF TXT records and detect missing, duplicate or weak sender policy configuration.

SPF DNS Authentication Guide

What does an SPF checker validate?

It reads the domain SPF TXT record and checks whether sender authorization policy exists, is unique and is strict enough for mail delivery.

Why is -all stronger than ~all?

-all tells receivers that unauthorized senders should fail, while ~all is a softfail policy often treated as less strict.

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