If you're running sendmail, then spamass-milter is the way to go.

On Sun, 29 Jul 2007, dalchri wrote:

> I've recently put SpamAssassin in front of my Exchange server as an SMTP
> proxy. Our previous spam filter would provide a 554 rejection notice for
> anything that was identified as spam. This meant that any FP would be
> notified so that email would not get silently ignored. Although a rejection
> notice was sent, we still retained the spam. This meant that when our users
> got a call from their customer about the rejected spam, they could quickly
> locate the message without it having to be resent.
> I would like to continue doing this with the new SA/Exchange setup. Right
> now I use spampd but I would like to change to Sendmail just because it is
> part of the default install for Redhat.
> How would you go about providing a 554 rejection notice? Would you do it on
> the SMTP proxy? On Exchange? Would you use Sendmail? Postfix? Something
> else?

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