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Greylite

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Greylite is a greylisting solution for qmail. Greylite may be preferred to other greylisting solutions because:
it does not require patching qmail, it is simply plugged in the top of the qmail chain; thus is works smoothly with already-patched installations
it does not depend on bigger RDBMSs like PostgreSQL or MySQL, it is self-contained because it uses sqlite
Greylite is easy to setup and maintain, and it is small and fast.
Installation:
1. fetch the latest greylite package
2. decompress it and get into its top dir
3. compile and install the software:
cc -O2 -lsqlite3 -o greylite greylite.c
install -s greylite /usr/local/bin/
4. prepare the greylite.db file:
sqlite3 -init greydb.sql /var/db/greylite.db
(then exit from the sqlite console with .quit or Ctrl-D). Well, any path and filename is ok, see controls below.
5. set it up into the qmail chain: edit the qmail-smtp run file, and change it from (example block taken from lifewithqmail.org)
/usr/local/bin/tcpserver -v -R -l "$LOCAL" -x /etc/tcp.smtp.cdb -c "$MAXSMTPD"
-u "$QMAILDUID" -g "$NOFILESGID" 0 smtp /var/qmail/bin/qmail-smtpd 2>&1
to
/usr/local/bin/tcpserver -v -R -l "$LOCAL" -x /etc/tcp.smtp.cdb -c "$MAXSMTPD"
-u "$QMAILDUID" -g "$NOFILESGID" 0 smtp /usr/local/bin/greylite /var/qmail/bin/qmail-smtpd 2>&1
6. be sure to enable greylisting from your .cdb file: change tcp.smtp from (example crafted manually)
friends
192.168.0.:allow,RELAYCLIENT=""
127.:allow,RELAYCLIENT=""
10.0.0.5:allow,RELAYCLIENT=""
bad guys
:allow
to
friends
192.168.0.:allow,RELAYCLIENT=""
127.:allow,RELAYCLIENT=""
10.0.0.5:allow,RELAYCLIENT=""
bad guys
:allow,GREYLIST=""
then recompile it with make (or alternatively tcprules tcp.smtp.cdb footmpcdbfile < tcp.smtp)
This makes it. You might be interested in some practical matters for effectively using greylisting.
Notes:
- if cc fails for some reason, be sure to have sqlite3 installed and reachable from the compiler path; possibly help the compiler with -I/headers/path and -L/libraries/path (for example -I/opt/local/include and -L/opt/local/lib).
- if you have more complicated command lines, for example with rbl modules before qmail-smtpd or authentication modules after it, just put greylite right before qmail-smtpd
Controls
Greylist can be controlled with the following environment variables:
1. GREYLIST &8212; if set (even empty), it makes greylite apply greylisting. Otherwise, greylite simply passes contro to qmail-smtpd transparently. This is meant to be set in the cdb file controlling tcpserver
2. DBFILE &8212; if set, it tells greylite where to look for the greylist database. Otherwise, greylite will look for /var/db/greylite.db. This is meant to be set in the cdb file controlling tcpserver, or manually from the ucspi command line with the env tool (tcpserver ... env DBFILE="/var/myfile.db" /usr/local/bin/greylite ...).
3. LOGTHRESHOLD &8212; if set between 0 (high) and 7 (low), it is the threshold of log messages: log messages with priority values exceeding this value are discarded. Otherwise, this level defaults to 3 (LOG_ERR).
What's New in This Release:
· The "354 go ahead (in reply to RCPT TO command)" bug was fixed when responding to non-suspicious clients at the second delivery attempt.

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