On Mon, Aug 07, 2023 at 11:24:30AM -0400, Alex 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?
The only plausible solution on your end is to not queue mail for this
domain, but rather proxy it through to the destination, with the
response to "." coming from the final downstream systems. This may be
possible with:
http://www.postfix.org/postconf.5.html#smtpd_proxy_filter
provided you can dedicate an IP address (port 25 smtpd(8) instance) for
this destination.
But the real solution is to get out of the way, they should receive
their mail directly from the Internet, and filter it as they see fit.
--
Viktor.
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