SMG: Addressing a specific spoof technique

I need a solution

Hi Guys,

Any idea how to block a spoofed email with this specific technique, below is the condition:

a) At MTA (SMG) level, we can see the actual or the real source of sender domain/address

b) But when the email reach to user mailbox, it appears as spoofed domain

(local domain, this by right should only comes from internal Exchange)




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