postfix <postfixmicromark.com.cn> writes:

> would it be possible to add the following function to your excellent postfix
> program.
>
> when an email is sent from post fix it is given a "magic key", if an email
> is returned an action can be performed based the key being from postfix or
> not.

What's that good for? When the returned mail strips the magic key, what
are you going to do? It could be legitimate or now -- you don't know,
because the key is gone.

> the problem i have is spammers using my domain name & user list to send fake
> emails out of their systems, so if a mailer they are sending to rejects the
> email it comes back to my domain.

Contact the operators of those mailers and ask them to reject invalid
mail rather than taking it in and bouncing it.

> some of my users are not so bright and are re-sending the emails out again,
> if i can prevent the emails hitting the users this would be helpful, as
> would a return message back to the sending site saying that the email was
> faked.

Educate them...

> a number of sites are trying to get me black listed purely because they see
> our domain name on the emails.

Name those blacklists and show one of the bogus blacklist actions, so we
know which blacklists not to use.

-- 
Matthias Andree

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