From: Peter H. Coffin (hellsopninehells.com)
Date: Sun Feb 01 2004 - 19:26:04 CST

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On Thu, Jan 29, 2004 at 09:41:02AM -0800, Roberto Samarone Araújo (RSA) wrote:
> I have an postfix server working fine but, I think it is allowing
> relay. If I configure my email on the email client, with a domain different
> from the domain on the server, my email client can use the server to send
> this email.
>
> Ex: my right email = xzdomain.com , the postfix server is
> configured to the domain: domain.com, if I configure my email on my email
> client, like zyamazon.com, my server send the email with From=
> zyamazon.com.
>
> Are there any way to solve this, in the other words, allow users
> sending emails only if the FROM email on email client exist on the server ?

Don't forget that, if you sending from a machine on $mynetworks, most
typical configurations will send the mail without caring what the
"From:" or "MAIL FROM" says. That's at most a forged sender, not a
relay.

--
62. I will design fortress hallways with no alcoves or protruding structural
    supports which intruders could use for cover in a firefight.
                --Peter Anspach's list of things to do as an Evil Overlord

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