On Thu, Feb 13, 2025 at 06:51:26PM -0500, Wietse Venema via Postfix-users wrote:

> Maybe. First you need to be clear about what you 
> mean with multiple From addresses:
> 
> Email with:
>     From: "[email protected]" <[email protected]>

Exchange accepts this.

> Email with:
>     From: "whatever" <[email protected]> <[email protected]>

Exchange accepts this.
 
> Email with:
>     From: "whatever" <[email protected]>, <[email protected]>

Exchange rejects this.

> Email with"
>     From: <[email protected]>
>     From: <[email protected]>

Exchange accepts this and seemingly rewrites the headers to look like:
From: <[email protected]>, <[email protected]>

So we need postfix to reject the 3rd case. Rejecting case 2 and 4 are optional 
to reject, but probably should be rejected since Exchange may correctly reject 
them in the future.


Thanks,
-Matt
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