diff --git a/debian/README.Debian b/debian/README.Debian
index 508b7df..375d197 100644
--- a/debian/README.Debian
+++ b/debian/README.Debian
@@ -58,4 +58,10 @@ In order to avoid the startup of the daemon on an unconfigured machine,
 automatic startup, on boot, is disabled by default. To enable it just edit the
 file /etc/default/postfwd and set the "startup" variable to 1.
 
+4. CHOOSING WHICH POSTFWD VERSION TO USE
+----------------------------------------
+
+Since some time, there is also a prefork version available, called postfwd2.
+You can choose in /etc/default/postfwd to use 'postfwd' or postfwd2'.
+
  -- Jan Wagner <waja@cyconet.org>  Mon, 10 Mar 2008 22:37:44 +0100
diff --git a/debian/postfwd.default b/debian/postfwd.default
index af87842..b3f4ec5 100644
--- a/debian/postfwd.default
+++ b/debian/postfwd.default
@@ -3,6 +3,8 @@
 # Set to '1' to enable startup (daemon mode)
 STARTUP=0
 
+# using 'postfwd' or 'postfwd2'?
+BINARY=postfwd
 # Config file
 CONF=/etc/postfix/postfwd.cf
 # IP where listen to
diff --git a/debian/postfwd.init b/debian/postfwd.init
index dcbd703..0e6e254 100644
--- a/debian/postfwd.init
+++ b/debian/postfwd.init
@@ -18,11 +18,6 @@
 
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 NAME=postfwd
-DAEMON=/usr/sbin/${NAME}
-PIDFILE=/var/run/$NAME.pid
-DESC=postfwd
-
-test -x $DAEMON || exit 0
 
 not_configured () {
         echo "#### WARNING ####"
@@ -39,6 +34,13 @@ no_configfile () {
 	exit 0
 }
 
+wrong_binary () {
+	echo "#### ERROR ####"
+	echo "${BINARY} is not a valid binary"
+	echo "###############"
+	exit 0
+}
+
 # check if postfwd is configured or not
 if [ -f "/etc/default/$NAME" ]
 then
@@ -58,12 +60,25 @@ then
 fi
 
 # Check whether we have to drop privileges.
-if [ -n "$RUNAS" ]; then
+if [ -n "$RUNAS" ]
+then
         if ! getent passwd "$RUNAS" >/dev/null; then
                 RUNAS=""
         fi
 fi
 
+if ! [ ${BINARY} == "postfwd" -o ${BINARY} == "postfwd2" ]
+then
+        wrong_binary
+fi
+
+NAME=${BINARY}
+DAEMON=/usr/sbin/${NAME}
+PIDFILE=/var/run/$NAME.pid
+DESC=postfwd
+
+test -x $DAEMON || exit 0
+
 set -e
 
 case "$1" in