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Is it default behavior of Plesk that mail is getting deferred in case of DNS lookup failure?

Alexander Davydov

Updated February 13, 2023 08:38

kb: how-to

Question

Is it default behavior of Plesk that mail is getting deferred in case of DNS lookup failure with the following message?

「451 4.7.24 SPF validation defer.」

Answer

This is default behavior in case SPF checking mode is set as Reject mail when SPF resolves to "fail" (deny) at Tools & Settings > Mail Server Settings > SPF spam protection page.

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