qmail-smtpd-run

#!/bin/sh

# Copy from http://www.lifewithqmail.org/ by Dave Sill, 30 November 2007
# License: "Life with qmail is covered by the OpenContent License, version 1.0. See http://www.opencontent.org/opl.shtml for the full license. Basically, you can copy, redistribute, or modify Life with qmail provided that modified versions, if redistributed, are also covered by the OpenContent License."
# https://web.archive.org/web/19981206111937/http://www.opencontent.org/opl.shtml
# or https://gist.github.com/alexh-name/ee2a9003039a284766f9ddd43a26e91b
# I slightly changed it. Alex H., 2016.

QMAILDUID="$(id -u qmaild)"
NOFILESGID="$(id -g qmaild)"
MAXSMTPD="$(cat /var/qmail/control/concurrencyincoming)"
LOCAL="$(head -1 /var/qmail/control/me)"

if [ -z "$QMAILDUID" -o -z "$NOFILESGID" -o -z "$MAXSMTPD" -o -z "$LOCAL" ]; then
    echo QMAILDUID, NOFILESGID, MAXSMTPD, or LOCAL is unset in
    echo /var/qmail/supervise/qmail-smtpd/run
    exit 1
fi

if [ ! -f /var/qmail/control/rcpthosts ]; then
    echo "No /var/qmail/control/rcpthosts!"
    echo "Refusing to start SMTP listener because it'll create an open relay"
    exit 1
fi

exec /usr/local/bin/softlimit -m 64000000 \
    /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