On Tue, Aug 08, 2023 at 01:28:51PM +0200, Matus UHLAR - fantomas via
Postfix-users wrote:
> >> > We're only doing basic spam protection for them,
> >>
> >> What is the nature of the "basic spam protection"? Can it be done
> >> pre-queue?
>
> On 07.08.23 15:19, Alex via Postfix-users wrote:
> >Yes, most likely, I would think. It's a basic spamassassin setup with a few
> >rules looking for specific patterns, as well as some RBL network checks.
>
> This can be done pre-queue within milter, using spamass-milter as glue.
Milters run pre-queue (manager), but to inspect message content they
need to coöperate with cleanup(8), while proxying the message directly
to its destination via a proxy filter happens before (instead of)
cleanup(8). So content-inspecting milters in Postfix are not an option.
One could of course always implement milter support in an SMTP proxy,
and use that as a proxy filter.
--
Viktor.
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