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Greylisting with qmail :::
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Greylisting with qmail
This document describes how to implement Greylisting with qmail.
What do we need?
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First of all we need qmail or netqmail.
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The QMAILQUEUE patch
makes it possible to insert another program into the qmail-queue structure.
This patch is part of netqmail.
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The qmail-qfilter
program allows the body and/or envelope of a message to be filtered
through a series of filters before being passed to the real qmail-queue
program, and injected into the qmail-queue.
Installation of Greylisting scripts
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Create a QMAILQUEUE script like this
exec /var/qmail/bin/qmail-qfilter \
/var/qmail/control/qmail-qfilter/greylisting.qfilter -- \
/var/qmail/control/qmail-qfilter/yourfilter1 -- \
/var/qmail/control/qmail-qfilter/yourfilter2
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Copy the
Greylisting qmail-qfilter script
to /var/qmail/control/qmail-qfilter/greylisting.qfilter
and set the permissions
chown root:qmail /var/qmail/control/qmail-qfilter/greylisting.qfilter
chmod 0755 /var/qmail/control/qmail-qfilter/greylisting.qfilter
This Greylisting script knows about SMTP AUTH users, TLS, SMTP Callback and
BATV.
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Copy the
Greylisting cron script
to your crontab directory and set the permissions
chown root:root greylisting.cron
chmod 0755 greylisting.cron
This crontab script manages the Greylisting DB e.g. the expiration of Greylisting records.
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Create the Greylisting DB directory and set the permissions:
mkdir -p /var/greylisting
chown qmaild:nofiles /var/greylisting
chmod 0700/var/greylisting
Share this directory to all your Mail Exchangers (MX).
Greylisting integration within qmail
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Activate your QMAILQUEUE script by using the environment varibale QMAILQUEUE in tcprules.
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Control the whitelisting and delay of Greylisting by using the environment varibale GREYLISTINGDELAY,
NOGREYLISTING and NOGREYWHITELISTING.
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