Running RH 9, SA 2.55 w/spamc/d, Postfix, procmail, ...
This would be "old fashioned" Postfix. I run 2.0.12, normally - but am looking at the current snapshot.
Q1.
Does a configuration exist (mailscanner, or such utilities) that would allow one to do a standard reject based on the hit score? Based on my existing setup, by the time the message goes through SA via spamc, it is already out of
postfix. I assume that means that a standard smtp type of reject could not be
done? Does anyone have a setup to reject rather than dev/null and, if so, how?
Under normal conditions you can configure Postfix itself to do regexp/pcre/RBL-based rejection on header and body content. Using Amavis-d (as I am) I can't do smtp rejections, since the smtpd daemon has already given a 201 acceptance. I must either bounce or quarantine.
However, the current Postfix snapshot smtpd can be configured to hang onto the client connection until Amavis-d has scanned the message. The release will probably be in a few months, according to the postfix developers. Whether this works or not in practice, we've all still to find out.
Q2. The downside to this is that it would add bounce messages to the flow of things and spammy often does not have valid return addresses. The upside is that if I dev/null and it was a valid message, the sender never knows the message was lost. If a reject is sent back, then the user could contact the recipient via some other means. Hence, would the reject, even if it could be done, be a good idea (my idea was to reject as a non-existent user).
That's your decision. I was doing this (smtpd reject high-score spam) for several months but came to the conclusion it was useless - client proxies and suchlike aren't configured to understand smtp 5xx refusals, they either drop the connection or keep on trying.
You don't have to dev-null spam with Amavis-d/SA-Exim, you can quarantine it in a dedicated directory. That's what I do.
Best,
Tony
-- Tony Earnshaw
I love the music of Wagner. The only sound that pleases me more is that of a cat outside my 9th floor window, trying to cling to the glass with its claws.
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