Sender Policy Framework (SPFSender Policy Framework) validation checks enable you to reject or hold messages that fail SPF
checks. You can specify different actions, depending on whether a Hard
failure or Soft failure occurs. See About
Sender Policy Framework Settings for more information.
In the SPF Hard Fail box, select one of:
For information about setting up other spam defenses, see Configuring Spam Policy.
In the SPF Soft Fail box, select one of:
For information about setting up other spam defenses, see Configuring Spam Policy.
You can only use SPF validation if your If you have enabled SPF validation, you might want to add servers to the white list of known machines from which you will always allow mail. Using the white list also prevents the overhead of performing SPF validation on trusted servers. The white list can also provide an alternative solution if SPF mistakenly fails a trusted server. For more information, see White Lists. If the References to Mail policy
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