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SPF setup (or internal) question


We have our utm setup as an incoming mail relay for various domains.

Problem is now that when someone spoofs the from adres, as one of our internals, it gets passed thourgh,

In the past we had some issue;s whn turning on SPF check.

My question now i, what if we turn on SPF check again. 


What happens to mail from domains that have no SPF at all???



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