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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 authenticate the 'Mail-From' address?
What is the maximum number of terms in an SPF record string?
What SPF mechanism should be used for a specific IP address?
Does SPF allow for comments within the record string?
What is the difference between '-all' and '?all' in SPF?
Does an SPF record affect inbound mail filtering?
What SPF mechanism specifies a list of IP addresses?
Does SPF check for a digital signature?
What is the impact of exceeding the SPF DNS lookup limit?
Does an SPF record need to be at the root domain?
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