Pedro David Marco:
> To my understanding, the Smuggled email contains SMTP data plus
> headers, plus body... , so what is the problem if filters check
> them as well?

Wietse:
> The problem is that Postfix receives TWO messages.
> https://www.postfix.org/smtp-smuggling.html#impact

Pedro David Marco via Postfix-users:
>  Thanks Wietse, yes it is clear in your doc, but both messages go
>  through filter?? despite what the MAIL FROM is?

Postfix receives TWO messages, It does not know that one message
was smuggled. That is the whole point.

        Wietse
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