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SPF

A comprehensive collection of questions and answers about SPF email authentication from email marketers, experts and technical documentation.

Does the 'exists' mechanism in SPF check for a record's existence?

Does an SPF record require a final 'all' mechanism?

Can an SPF record have an 'include' mechanism that points to itself?

What SPF mechanism should be used to explicitly deny all other senders?

Does SPF apply to subdomains by default?

Does an SPF record need to be in a specific order?

What is the effect of an SPF record with no 'all' mechanism?

Does SPF authenticate the 'Mail-From' address?

What is the difference between '-all' and '?all' in SPF?

Does an SPF record affect inbound mail filtering?

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