Identify legit emails vs Spoofed emails in the Header

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Contributor

Hi everyone,

 

Is there any way to differentiate between legit and spoofed emails from looking into email header?

 

We saw an spoofed email saying via return--path in the To:... section. And it comes from return--path.com.

 

So what is the area of mismatch between legit and spoofed email that exchange or outlook consider one as an unverified email?

 

How does Outlook/Exchange process to choose and pick the legit emails?

 

Thanks

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