diff --git a/install_update_dovecot.sh b/install_update_dovecot.sh
index 30c1069..f67b1ff 100755
--- a/install_update_dovecot.sh
+++ b/install_update_dovecot.sh
@@ -2318,7 +2318,70 @@ else
    fatal "Adjusting /usr/local/dovecot-${_version}/etc/dovecot/conf.d/90-sieve.conf"
 fi
 
-mkdir -p /usr/local/dovecot-${_version}/etc/dovecot/sieve/global/
+# - Add Setting from Pigeonhole Sieve: Vacation Extension
+# -
+echononl "\tAdd Setting for included Pigeonhole Sieve: Vacation Extension"
+_found=false
+_tmp_file="/tmp/dovecot_conf_90-sieve.conf"
+cp -a "/usr/local/dovecot-${_version}/etc/dovecot/conf.d/90-sieve.conf" "$_tmp_file" > /dev/null 2>&1
+:> $_tmp_file
+while IFS='' read -r _line || [[ -n $_line ]] ; do
+
+   echo "$_line" >> "$_tmp_file"
+
+   if ! $_found && $(echo "$_line" | grep -i -E "^\s*plugin {" > /dev/null 2>&1) ; then
+      _found=true
+
+      cat <<EOF >> "$_tmp_file"
+
+  # Add Setting 'sieve_vacation_send_from_recipient' from (included) 
+  #
+  #    Pigeonhole Sieve: Vacation Extension
+  #    ====================================
+  #
+  # sieve_vacation_send_from_recipient
+  #
+  #     Default: no
+  #
+  #     Values: Boolean
+  #
+  # This setting determines whether vacation messages are sent with the
+  # SMTP MAIL FROM envelope address set to the recipient address of the
+  # Sieve script owner.
+  #
+  # Normally this is set to <>, which is the default as recommended in the
+  # specification. This is meant to prevent mail loops. However, there are
+  # situations for which a valid sender address is required and this setting
+  # can be used to accommodate for those.
+  #
+  sieve_vacation_send_from_recipient = yes
+
+EOF
+   fi
+done < "/usr/local/dovecot-${_version}/etc/dovecot/conf.d/90-sieve.conf"
+cp -a "$_tmp_file" "/usr/local/dovecot-${_version}/etc/dovecot/conf.d/90-sieve.conf" > /dev/null 2>&1
+echo -e "$rc_done"
+
+
+echononl "\tCreate Directory for global sieve scripts"
+mkdir -p "/usr/local/dovecot-${_version}/etc/dovecot/sieve/global/" > $log_file 2>&1
+if [ "$?" = 0 ]; then
+   echo -e "$rc_done"
+else
+   echo -e "$rc_failed"
+   error "$(cat $log_file)"
+
+   echononl "\tcontinue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+
+fi
+
 
 ## - ceate global sieve script
 ## -