I've installed Postfix 1.1.11 and SpamAssassin 2.43. Currently, SA is set up
in the standard way, as a content filter during delivery. I'd like to use it
instead to provide the same capabilities as the header_checks and
body_checks configuration parameters, to allow rejection of spam during the
data transfer phase of the SMTP transaction instead of depending on the
(highly unreliable) ability to bounce the message after the spam is accepted
for delivery. Has anyone done this, or can it be done?

I'm not particularly interested in installing amavis or anything else of a
similar nature, as I don't read email on a system that's susceptible to
viruses. If that's what it takes to get this to work, however, I'll do it.

Yes, I know that SA will reject some small amount of real email. I'm willing
to accept that in exchange for not allowing spam any residence on my system
at all.

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