From: Chris Ricker (no email)
Date: Fri Feb 01 2002 - 10:26:08 EST
I did some work for a friend who uses another MTA (shameful, I know, but at
least it was exim), and I noticed it has interesting RBL features.
* Its RBL support can be configured on a per-user level, so that you can do
things like block spam to end users, but not filter any mail to postmaster.
Mildly cool, but I'm not that interested by that one (and if I were, I think
the same could be accomplished with postfix and some crazy tables)....
* More importantly, though, it can be configured so that instead of
rejecting based on RBL, it just adds an additional mail header:
X-RBL-Warning: <domain> is a potential spammer
(or something to that effect).
I *really* like this last feature. I've so far been unwilling to use RBL or
similar for clients, since for some people even one false positive is
unacceptable. If Postfix could just add a warning, rather than reject
outright, then users could choose to filter on that, or not, as they see
fit.
Is there any way to get postfix to do the same thing? It looks to me like
the only way would be handing it to filter, and then running it through some
perl, which is liable to be unacceptably slow....
later,
chris
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