> 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.
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.
So I would do this in place of the transport filter I currently have in
place?
example.com smtp:mx1.hc4719.iphmx.com
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