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David Brown
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Exchange 2013 SPF validation 'None' for local/company domain.

When we receive spoofed emails appearing to come from our own domain of acme.co for example Exchange 2013 reflects 'none' for SPF record. We have a valid SPF record with our registrar and an mx record of mail.acme.co which works for all addresses other than acme.co

Just thinking out loud i am guessing that when Exchange attempts to validate the SPF record it queries our local domain of acme.co and DNS/AD server where there is no SPF record and replies none?
Internet / Email SoftwareExchangeDNS

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Simon Butler (Sembee)

8/22/2022 - Mon
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Simon Butler (Sembee)

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