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?
David BrownCIOAsked:
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Simon Butler (Sembee)ConsultantCommented:
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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