Use Case - very specific purpose

I have two domains which I have access to both domains DNS
I want all emails coming from domain A to domain B to be piped to a script, however I don’t want to accept any other emails from any other domains and also do not want to accept emails pretending to be from domain A (SPF? DKIM ? don’t know)

Any ideas

Possible? Yes should be very possible.

However, this is completely outside the scope of MiaB.

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