Sounds like you need to set up your email servers to reject relayed mail 
(see the postfix documentation for details).
Sam Przyswa wrote:
> Hi,
>
> After installing Postfix-Policyd it work fine and seems very efficient
> but I got a lot of mailer-daemon returned mail from spamers who used
> some valid users addresses form our domain to send spam on others
> systems. And if these mails aren't delivered the mails back to my users
> with 554 SMTP error who don't understand because they never sent these
> mail !
>
> How to fix this problem ?
>
> Thanks in advance for your help.
>
> Sam.
>
>
>
>
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