Get the code and unzip it:

useradd smtpd
cd /home/smtpd
wget http://smtpd.develooper.com/files/qpsmtpd-0.32.tar.gz
tar zxvpf qpsmtpd-0.32.tar.gz

Set up some directories and permissions:

chown -R smtpd:users qpsmtpd-0.32
chmod o+t qpsmtpd-0.32
ln -s qpsmtpd-0.32 qpsmtpd
cd qpsmtpd
mkdir tmp; chown smtpd:users tmp; chmod 700 tmp

Build, test, and install:

perl Makefile.PL
make && make test && make install
mv config.sample/ config

cp /var/tmp/qp_fork/run .     # [1]
chmod +x ./run
cp /var/tmp/qptest/log/run log/   # [2]
chmod +x ./log/run
echo "/home/smtpd/qpsmtpd/tmp" > config/spool_dir
cd /service/
ln -s /home/smtpd/qpsmtpd .

Watch in awe...

sleep 5;
tail -f /home/smtpd/qpsmtpd/log/main/current

[1]

• Create the following file and save at /var/tmp/qp_fork/run
• On AMD64 platforms use 50000000 for softlimit if you get an out of memory error

#!/bin/sh
exec 2>&1 \
sh -c '
  exec \
    /usr/local/bin/softlimit -m 25000000 \
    ${PERL-perl} -T ./qpsmtpd-forkserver \
    --listen-address 0 \
    --port 2525 \
    --limit-connections 40 \
    --max-from-ip 10 \
    --user smtpd
'

[2]

• Then create this next file at /var/tmp/qp_fork/log/run

#!/bin/sh

export LOGDIR=./main

mkdir -p $LOGDIR

exec /usr/local/bin/multilog t s16777215 n30 $LOGDIR