Re: [AMaViS-user] How to bypass spam filtering

Bill,

> >>> ...I run multiple content-filters, and the first one actually pipes
> >>> mail (via the Postfix "sendmail" command) back into postfix which
> >>> uses the "pickup" daemon to retrieve the message.

If you have a choice, these system messages could be submitted via SMTP
to Postfix on port 10025, e.g. by mini_sendmail, instead of submitted
to maildrop directory through sendmail command.

> >>> I have not been able to figure out
> >>> if there is a way to tell "sendmail" to use an alternate "pickup"
> >>> daemon when piping a message back to Postfix.

I don't think there is a way. Pickup picks messages from a maildrop directory,
and by the time message gets there, it is undistinguishable from other
messages submitted by 'sendmail' binary.

> I wrote a script that delivers the post-scanned MessageSniffer message
> directly to amavisd-new on 127.0.0.1:10024 by using the smtpclient to
> handle the delivery instead the Postfix sendmail client. This appears to
> be working great, and allows me to bypass content filtering on the Postfix
> "pickup" daemon. Chaining the content-filters together also reduces the
> number of message hand-offs and also cuts down on the amount of Postfix
> logging.

Good.

> The message delivery process now looks like: Postfix --> MessageSniffer
> --> Amavisd-new --> Postfix --> Maildrop --> Dovecot, removing the Postfix
> hand-off between MessageSniffer and Amavisd-new.
>
> Mark, is amavisd-new missing anything that I should be concerned about by
> having mail injected via SMTP vs. ESMTP? I noticed that Postfix delivers
> to Amavisd via ESMTP, but the smtpclient delivers via SMTP.

Since you were happy with a previous use of pipe/sendmail, you probably
won't be missing much. As mouss stated, you'd be throwing away DSN
options, PIPELINING and 8BITMIME announced capability, and ability to
pass client IP address to amavisd through XFORWARD smtp command extension,
but you didn't have these before either.

Mark

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