On December 5, 2022 4:19:21 PM UTC, Sean Hennessey 
<sean.hennes...@mercurygate.com> wrote:
>I'm curios if it's possible to set up postfix to rewrite the envelop from 
>address for all email the instance is relaying? I'm doing some research and 
>want to force the envelop from to be a known value that I know will pass spf 
>checks.
>
>Thanks in advance.

Not just using postfix.  With a milter, it's quite possible.  
https://github.com/croessner/vrfydmn does not do exactly what you're asking 
for, but it's in the ballpark to give an idea of how to approach the problem.

Scott K

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