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SPF

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

What is the maximum number of DNS lookups allowed in an SPF record?

What DNS record type is used for SPF?

Can an SPF record contain multiple 'v=spf1' declarations?

Does SPF authenticate the 'From' header directly?

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

Does SPF apply to the 'Return-Path' address?

What happens if an SPF record is missing?

What SPF mechanism includes the MX records of a domain?

Can an SPF record use both 'ip4' and 'ip6' mechanisms?

What is the maximum length of an SPF TXT record string?

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