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From: Andrzej Adam Filip on 12 Feb 2010 09:55
Dietmar Rieder <nospam(a)tugraz.at> wrote:
> is there a way to avoid bouncing of rejected messages?
> We have the following situation:
>
> Our sendmail server is the MX for many downstream servers to which we
> are serving incoming messages via LDAP routing, so we know all valid
> users and do not have the common problem of bouncing messages sent to
> unknown users at the downstream servers.
>
> At the MX, we are using several anti-Spam techniques that reject
> messages based on different rules and Spam that passes that rules gets
> tagged but we (legally) have to forward it to the downstream
> servers. But, unfortunately some of our downstream server use
> Spam-fighting tools to reject spammy messages, which in turn leads to
> a bounce generation at our MX.
>
> Now, I'd like to avoid bouncing such messages (as they are already
> Spam), it there a simple way to achieve this? e.g. quarantine instead
> of bouncing?

It is not "a simple way" but "possible sendmail development path":
Sendmail may change sendmail-milter interactions to make milter capable
to "delay" sending acceptance of "the final dot" to sending host while
observing per recipient delivery status of sendmail delivery attempts.

IMHO 5-10s delay would allow to detect most of "spam rejects by primary
MXes" on secondary MX before taking over responsibility for message
delivery (deliver or send back bounce message).

--
[pl>en Andrew] Andrzej Adam Filip : anfi(a)onet.eu : Andrzej.Filip(a)gmail.com
We were happily married for eight months. Unfortunately, we were married
for four and a half years.
-- Nick Faldo
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