SPF
Is Your SPF Quietly Broken?
SPF can pass and still be silently broken. Here is how the ten DNS lookup limit quietly switches off your protection, and why it needs continuous monitoring.
SPF
SPF can pass and still be silently broken. Here is how the ten DNS lookup limit quietly switches off your protection, and why it needs continuous monitoring.
Explainer
SPF is a public guest list of the servers allowed to send email for your domain. It is simple in concept and surprisingly easy to break in practice. Here is how it works, the 10-lookup limit that catches everyone out, and why SPF alone will not protect you.
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