Quoting Justin Mason (jm at jmason.org):
> Marc's work *is* nifty, he's done a good job of integration there.
> But there are alternative ways to implement SpamAssassin with
> Postfix at the MTA level.
> The easy way is to define a simple transport to filter all mail
> through SpamAssassin:
>http://wiki.spamassassin.org/w/IntegratedInMta>> The more complex, but in this case more useful and sa-exim-ish way:
>http://wiki.spamassassin.org/w/IntegratedInPostfixWithAmavis
Unfortunately, these miss 95% of the advantage of Marc's approach,
e.g., allowing none of sa-exim's callback capabilities.
Essentially, Marc is leveraging what in any other circumstance would be
considered a significant _disadvantage_ of the Exim architecture -- its
non-modular nature: All of his processing is conducted integral to the
single Exim monolithic process.
If you disagree, then please show me the Postfix configuration that
makes it selectively 45x teergrube, on a real-time decision basis, any
delivering MTA whose SMTP stream is showing a SpamAssassin spamicity
index of 10 or greater based on analysis of the full message body text
(not just headers). I'm not saying that's impossible in Postfix (though
it may be, given its modularity), only that nobody's figured that out
today, and that a great deal of work would be required to duplicate
sa-exim's functionality.
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