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Stephan,
> Using Postfix, it is not possible to reject the original SMTP sessions if
> SPAM was detected by amavisd-new
With Postfix, rejecting on the original SMTP session is only possible
when using content filter in a smtp-proxy setup, which is similar in concept
to other MTA pre-queue setups (e.g. sendmail milter).
> while it works well e.g. with sendmail and amavis-milter.
Whether it works well or not is a matter of discussion.
Pre-queue content filtering works well with lightweight content filters
and/or lightly loaded mailers. Using SA in this setup brings its own set
of problems (which may be acceptable to some, and not for most sites).
> What possibilities are there to have Postfix reject
> SPAM more effectively? My aim would be to reject as many "bad" SMTP
> sessions as possible before letting amavisd-new have a look at the
> accepted messages.
Let Postfix reject whatever it can reliably and quickly reject (as others
are suggesting), perhaps with an aid of some simple proxy content filter.
Whatever comes across this stage should best be handled as a post-queue
content filter such as amavisd-new + SA.
From Matt:
> I am pretty sure you can configure Postfix to use amavisd-new as an SMTP
> proxy, but all the documentation I've read about it doesn't suggest it.
While amavisd-new is in principle a smtp proxy, it is not a _transparent_
proxy, and as such it doesn't play by all the rules required for a Postfix
proxy filter. Some people use amavisd-new in such a setup (on not too busy
mailers), but you are more or less on your own: may work today in one
particular setup, but there is no promise it will work well for all.
Mark
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