From: Magnus Bäck (no email)
Date: Sun Feb 01 2004 - 06:04:20 EST
On Sunday, February 01, 2004 at 12:00 CET,
Rene Bartsch <> wrote:
> As I haven't found a developer's list, I'm posting to this list. If
> there is one, please point me to.
There is no Postfix developer list.
> Now my idea:
>
> If a spammer sends a mail, it is processed by postfix, goes through
> filter-chains like amavisd-new with SpamAssassin and F-Prot and is
> distributed to IMAP-folder by e.g. procmail.
>
> But that way the Spammer has success or believed success as he can
> deliver his spam to the MTA. The sender of a wanted mail may be
> deceived when the spam-filter drops a mail. Sending a error-mail
> cannot be done, too, as address-spoofing would result in a DoS-Attack
> to the stolen address. So the only way is to disconnect the
> SMTP-connection with error.
>
> If Postfix would keep the SMTP-connection until the mail has passed
> the filter chains, it would be possible to disconnect the
> SMTP-connection with a OK in case the mail is fine or with a failure
> in case the mail is malicious and dropped by one of the filters.
>
> So a friendly mailer would get a error-report if his mail has been
> mis-detected and a spammer would get an error-report making him aware
> this address is useless for him.
You are suggesting a possibility to reject rather than bounce spam. This
is already available with the SMTP proxy feature in the snapshots and
upcoming Postfix 2.1.
-- Magnus Bäck
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