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

Posted on 2014-11-26
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Last Modified: 2016-06-15
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?
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Question by:David Brown
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Simon Butler (Sembee) earned 2000 total points
ID: 40467454
If you have a complete zone for your domain internally, then you would need to put an SPF record in to that zone. No SPF record then it is treated the same way as external domain with no SPF record.

Simon.
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