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Email authentication

SPF

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

Does SPF allow for CIDR notation in 'ip4' and 'ip6' mechanisms?

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

What SPF mechanism includes the IP addresses of the sending domain?

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?

What is the purpose of the SPF 'a' mechanism?

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

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

What SPF mechanism checks for a valid pointer record?

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