diff --git a/dovecot_convert_to_lmtp.sh b/dovecot_convert_to_lmtp.sh
new file mode 100755
index 0000000..db7e729
--- /dev/null
+++ b/dovecot_convert_to_lmtp.sh
@@ -0,0 +1,270 @@
+#!/usr/bin/env bash
+
+postfix_main_cf="/etc/postfix/main.cf"
+
+backup_date="$(date +%Y-%m-%d-%H%M)"
+changed=false
+
+log_file="$(mktemp)"
+
+# -------------
+# - Functions an Variable
+# -------------
+clean_up() {
+
+
+   if [[ -f "$_backup_crontab_file" ]]; then
+
+      echononl "(Re)Install previously saved crontab from '$_backup_crontab_file'.."
+
+      crontab $_backup_crontab_file >> $log_file 2>&1
+
+      if [[ $? -eq 0 ]]; then
+         echo -e "$rc_done"
+      else
+         echo -e "$rc_failed"
+         error "$(cat $log_file)"
+      fi
+
+   fi
+
+   # Perform program exit housekeeping
+   rm -f $log_file
+   blank_line
+   exit $1
+}
+
+fatal(){
+   echo ""
+   echo -e "\t[ \033[31m\033[1mFatal\033[m ]: \033[37m\033[1m$*\033[m"
+   echo ""
+   echo -e "\t\033[31m\033[1m           Skript wird abgebrochen\033[m\033[m\n"
+   rm -f $log_file
+   clean_up 1
+}
+
+
+echononl(){
+   echo X\\c > /tmp/shprompt$$
+   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+      echo -e "$*\\c" 1>&2
+   else
+       echo -en "$*" 1>&2
+   fi
+   rm /tmp/shprompt$$
+}
+error(){
+   echo ""
+   echo -e "\t[ \033[31m\033[1mError\033[m ]: $*"
+   echo ""
+}
+
+warn(){
+   echo ""
+   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
+   echo ""
+}
+
+info(){
+   echo ""
+   echo -e "\t[ \033[32m\033[1mInfo\033[m ]: $*"
+   echo ""
+}
+
+echo_done() {
+   echo -e "\033[75G[ \033[32mdone\033[m ]"
+}
+echo_ok() {
+   echo -e "\033[75G[ \033[32mok\033[m ]"
+}
+echo_warn() {
+   echo -e "\033[75G[ \033[33mwarn\033[m ]"
+}
+echo_failed(){
+   echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
+}
+echo_skipped() {
+   echo -e "\033[75G[ \033[90m\033[1mskipped\033[m ]"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+
+if [[ ! -f "$postfix_main_cf" ]] ; then
+   fatal "Postfix configuration '${postfix_main_cf}' NOT found!"
+fi
+
+# ----------
+# - Some checks ..
+# ----------
+# -Is systemd supported on this system?
+# -
+systemd_supported=false
+systemd=$(which systemd)
+systemctl=$(which systemctl)
+
+if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
+   systemd_supported=true
+fi
+
+blank_line
+
+echononl "   Backup Postfix Cconfiguration file '${postfix_main_cf}'.."
+if [[ ! -f "${postfix_main_cf}.${backup_date}" ]] ; then 
+   cp -a "${postfix_main_cf}" "${postfix_main_cf}.${backup_date}" > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+   
+
+
+blank_line
+
+# - /etc/postfix/main.cf
+# -
+# - comment in:
+# -    #virtual_transport = dovecot
+# -    #dovecot_destination_recipient_limit = ..
+# -
+# - change:
+# -    smtpd_sasl_auth_enable = yes
+# -    smtpd_sasl_type = dovecot
+# -    smtpd_sasl_path = private/dovecot-auth
+# -    virtual_transport = lmtp:unix:private/dovecot-lmtp
+var="smtpd_sasl_auth_enable"
+val="yes"
+echononl "   ${postfix_main_cf}: adjust '${val}'.."
+if ! $(grep -E -q "^\s*${var}\s*=\s*${val}" ${postfix_main_cf} 2> /dev/null) ; then
+   perl -i -n -p -e "s#^(\s*)(smtpd_sasl_type\ *=.*)#smtpd_sasl_type = dovecot#" \
+      /etc/postfix/main.cf > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+      changed=true
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+
+var="smtpd_sasl_type"
+val="dovecot"
+echononl "   ${postfix_main_cf}: adjust '${val}'.."
+if ! $(grep -E -q "^\s*${var}\s*=\s*${val}" ${postfix_main_cf} 2> /dev/null) ; then
+   perl -i -n -p -e "s#^(\s*)(smtpd_sasl_type\ *=.*)#smtpd_sasl_type = dovecot#" \
+      /etc/postfix/main.cf > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+      changed=true
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+
+var="smtpd_sasl_path"
+val="private/dovecot-auth"
+echononl "   ${postfix_main_cf}: adjust '${val}'.."
+if ! $(grep -E -q "^\s*${var}\s*=\s*${val}" ${postfix_main_cf} 2> /dev/null) ; then
+   perl -i -n -p -e "s#^(\s*)(smtpd_sasl_type\ *=.*)#smtpd_sasl_type = dovecot#" \
+      /etc/postfix/main.cf > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+      changed=true
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+
+var="virtual_transport"
+val="lmtp:unix:private/dovecot-lmtp"
+echononl "   ${postfix_main_cf}: adjust '${val}'.."
+if ! $(grep -E -q "^\s*${var}\s*=\s*${val}" ${postfix_main_cf} 2> /dev/null) ; then
+   perl -i -n -p -e "s#^(\s*)(smtpd_sasl_type\ *=.*)#smtpd_sasl_type = dovecot#" \
+      /etc/postfix/main.cf > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+   else
+      echo_failed
+      changed=true
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "   Comment variable 'dovecot_destination_recipient_limit'.."
+if $(grep -E -q "^\s*dovecot_destination_recipient_limit" ${postfix_main_cf} 2> /dev/null) ; then
+   perl -i-n -p -e "s/^(\s*)(dovecot_destination_recipient_limit.*)/\1\#\2/" /etc/postfix/main.cf > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+      changed=true
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+else
+   echo_skipped
+fi
+
+blank_line
+
+# - restart postfix
+# -
+echononl "   Restart Postfix Service..."
+if $changed ; then
+   if $systemd_supported ; then
+      systemctl restart postfix > /dev/null 2>&1
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+      fi
+   else
+      /etc/init.d/postfix restart > /dev/null 2>&1
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+      fi
+   fi
+else
+   echo_skipped
+fi
+
+
+diff "${postfix_main_cf}" "${postfix_main_cf}.${backup_date}"  > /dev/null 2>&1
+if [[ $? -eq 0 ]]; then
+
+   info "File \033[1m${postfix_main_cf}\033[m has not changed.
+                  \033[32mGoing to remove previos created backup\033[m.."
+
+   echononl "   Remove file \033[1m${postfix_main_cf}.${backup_date}\033[m .."
+   rm "${postfix_main_cf}.${backup_date}" > $log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+   else
+      echo_failed
+      error "$(cat "$log_file")"
+   fi
+fi
+
+
+clean_up 0