A perl script, cidr2tcprules.pl, is included which will convert some
DNSBL lists into data suitable for feeding into tcprules.  For example,
to configure the software such that clients on dialup have a banner
sleep of 30 seconds, clients listed in SPEWS have a long banner, and
clients on the local LAN have no sleep, the standard banner, and no
signature filtering:

# cd /var/qmail/control
# rsync -avz rsync://rsync.bliab.com/sorbs/dul.dnsbl.sorbs.net .
# wget http://mirror.bliab.com/spews/SPEWS.cidr.bz2
# cidr2tcprules.pl 'BANNERPOSTSLEEP="30"' < dul.dnsbl.sorbs.net | tcprules dul.{cdb,tmp}
# bzip2 -dc SPEWS.cidr.bz2 | cidr2tcprules.pl 'BANNERFILE="control/banner.spews"' | tcprules spews.{cdb,tmp}
# cat <<'EOF' > banner.spews
$ME ESMTP NO-UCE
Hello [$TCPREMOTEIP], connection logged at $DATE
EOF
# echo some.domain.com > me
# cat <<EOF | cidr2tcprules.pl 'REJECTSIG="0"' | tcprules local.{cdb,tmp}
192.168.0.0/16
EOF

# env - TCPREMOTEIP=127.0.0.1 qmail-banner -x local.cdb -x dul.cdb -x spews.cdb /usr/bin/printenv 
TCPREMOTEIP=127.0.0.1

# env - TCPREMOTEIP=127.0.0.2 qmail-banner -x local.cdb -x dul.cdb -x spews.cdb /usr/bin/printenv 
220-Go ahead
TCPREMOTEIP=127.0.0.2
BANNERPOSTSLEEP=30

# env - TCPREMOTEIP=202.101.63.0 qmail-banner -x local.cdb -x dul.cdb -x spews.cdb /usr/bin/printenv 
220-some.domain.com ESMTP NO-UCE
220-Hello [202.101.63.0], connection logged at Mon, 29 Mar 2004 23:12:22 +1000
TCPREMOTEIP=202.101.63.0
BANNERFILE=control/banner.spews

# env - TCPREMOTEIP=192.168.1.1 qmail-banner -x local.cdb -x dul.cdb -x spews.cdb /usr/bin/printenv 
TCPREMOTEIP=192.168.1.1
REJECTSIG=0