Thanks Wietse, yes it is clear in your doc, but both messages go through 
filter?? despite what the MAIL FROM is?
Thanks,
Pedro.

    On Tuesday, December 26, 2023 at 03:34:34 PM GMT+1, Wietse Venema via 
Postfix-users <[email protected]> wrote:  
 
 Pedro David Marco via Postfix-users:
> To my understanding, the Smuggled email contains SMTP data plus
> headers, plus body... , so what is the problem if filters check
> them as well?

The problem is that Postfix receives TWO messages.

https://www.postfix.org/smtp-smuggling.html#impact

    Wietse
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