diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index abe2f01..cc52af0 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -12,6 +12,10 @@ _TLS_KEY_FILE="${_TLS_CERT_DIR}/mailserver.key"
 _TLS_CA_FILE=/etc/ssl/certs/ca-certificates.crt
 
 postfix_master_cf="/etc/postfix/master.cf"
+postfix_spool_dir="/var/spool/postfix"
+
+postgrey_socket_dir="${postfix_spool_dir}/postgrey"
+postgrey_socket_file="${postgrey_socket_dir}/postgrey.sock"
 
 
 tmp_err_msg=$(mktemp)
@@ -492,7 +496,7 @@ else
 fi
 
 
-if [[ "$os_dist" = "debian" ]] && [[ $os_version -lt 10 ]] ; then
+if [[ "$os_dist" = "debian" ]] && [[ $os_version -ne 10 ]] ; then
    ## - Install Postgrey from debian packages system
    ## -
    echononl "   Install Postgrey from debian packages system"
@@ -510,7 +514,15 @@ if [[ "$os_dist" = "debian" ]] && [[ $os_version -lt 10 ]] ; then
    fi
 
    echononl "   Adjust /etc/default/postgrey"
-   perl -i -n -p -e "s#^(\s*)(POSTGREY_OPTS=.*)#\#\1\2\nPOSTGREY_OPTS=\"--inet=10023 --delay=149 --auto-whitelist-clients=3 --lookup-by-subnet\"#" \
+
+   # postgrey as tcp/ip socket
+   #
+   #perl -i -n -p -e "s#^(\s*)(POSTGREY_OPTS=.*)#\#\1\2\nPOSTGREY_OPTS=\"--inet=127.0.0.1:10023 --delay=149 --auto-whitelist-clients=3 --lookup-by-subnet\"#" \
+   #   /etc/default/postgrey > $tmp_err_msg 2>&1
+   
+   # postgrey as unix socket
+   #
+   perl -i -n -p -e "s#^(\s*)(POSTGREY_OPTS=.*)#\#\1\2\nPOSTGREY_OPTS=\"--unix=/var/spool/postfix/postgrey/postgrey.sock --delay=149 --auto-whitelist-clients=3 --lookup-by-subnet\"#" \
       /etc/default/postgrey > $tmp_err_msg 2>&1
    if [[ $? -eq 0 ]] ; then
       echo_ok
@@ -536,6 +548,44 @@ EOF
       echo_failed
    fi
 
+   echononl "   Create the Postgrey socket directory in Postfix's work aerea.."
+   if [[ -d "${postgrey_socket_dir}" ]]; then
+      echo_skipped
+   else
+      mkdir "${postgrey_socket_dir}" > /dev/null 2> $tmp_err_msg
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+         error "$(cat $tmp_err_msg)"
+
+         echononl "\tcontinue anyway [yes/no]: "
+         read OK
+         OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+         while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+            echononl "Wrong entry! - repeat [yes/nno]: "
+            read OK
+         done
+         [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+
+      fi
+   fi
+
+   echononl "   Enable Postgrey service at boot time.."
+   if $systemd_exists ; then
+      systemctl enable networking >/dev/null 2> $tmp_err_msg
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+         error "$(cat $tmp_err_msg)"
+      fi
+   else
+      echo_skipped
+      warn "Skipped this step because systemd service was not found."
+   fi
+
+
    echononl "   Restart postrey daemon"
    if $systemd_exists ; then
       systemctl restart postgrey > /dev/null 2> $tmp_err_msg
@@ -555,7 +605,8 @@ EOF
       fi
    fi
 
-   postgrey_socket=""
+   postgrey_socket="postgrey/postgrey.sock"
+   #postgrey_additional_options="postgrey_time_limit = 3600"
    postgrey_additional_options=""
 
 else