diff --git a/add_dkim_key.sh b/add_dkim_key.sh
index 2c8ed53..4e30029 100755
--- a/add_dkim_key.sh
+++ b/add_dkim_key.sh
@@ -209,6 +209,8 @@ DEFAULT_KEY_NAME="update-dkim"
 DEFAULT_DKIM_TYPE="DKIM1"
 DEFAULT_KEY_TYPE="rsa"
 
+DEFAULT_SERVICE_TYPE="email"
+
 DEFAULT_DKIM_SELECTOR=""
 
 
@@ -288,6 +290,7 @@ if $terminal ; then
    done
 
 
+
    echo ""
    echo -e "\033[32m--\033[m"
    echo ""
@@ -303,30 +306,6 @@ if $terminal ; then
    done
 
 
-   echo ""
-   echo -e "\033[32m--\033[m"
-   echo ""
-   echo -e "   Insert DNS master server for domain \033[1m$DKIM_UPDATE_ZONE\033[m"
-   echo ""
-   echo ""
-
-   if [[ -n "${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}" ]] ; then
-      echononl "   DNS master server [${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}]: "
-      read DNS_DKIM_ZONE_MASTER_SERVER
-      if [[ "X$DNS_DKIM_ZONE_MASTER_SERVER" = "X" ]] ; then
-         DNS_DKIM_ZONE_MASTER_SERVER="${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}"
-      fi
-   else
-      echononl "   DNS master server: "
-      read DNS_DKIM_ZONE_MASTER_SERVER
-      while [[ "X$DNS_DKIM_ZONE_MASTER_SERVER" = "X" ]] ; do
-         echo -e "\n\t\033[33m\033[1mEingabe erforderlich.\033[m\n"
-         echononl "   DNS master server: "
-         read KEY_SECRET
-      done
-   fi
-
-
 
    echo ""
    echo -e "\033[32m--\033[m"
@@ -365,6 +344,75 @@ if $terminal ; then
    fi
 
 
+   echo ""
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo -e "   Insert DNS master server for domain \033[1m$DKIM_UPDATE_ZONE\033[m"
+   echo ""
+   echo ""
+
+   if [[ -n "${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}" ]] ; then
+      echononl "   DNS master server [${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}]: "
+      read DNS_DKIM_ZONE_MASTER_SERVER
+      if [[ "X$DNS_DKIM_ZONE_MASTER_SERVER" = "X" ]] ; then
+         DNS_DKIM_ZONE_MASTER_SERVER="${DEFAULT_DNS_DKIM_ZONE_MASTER_SERVER}"
+      fi
+   else
+      echononl "   DNS master server: "
+      read DNS_DKIM_ZONE_MASTER_SERVER
+      while [[ "X$DNS_DKIM_ZONE_MASTER_SERVER" = "X" ]] ; do
+         echo -e "\n\t\033[33m\033[1mEingabe erforderlich.\033[m\n"
+         echononl "   DNS master server: "
+         read KEY_SECRET
+      done
+   fi
+
+
+   echo ""
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo "   Specifies Service type (Flag 's=')"
+   echo ""
+
+   if [[ "email" = "${DEFAULT_SERVICE_TYPE}" ]] ; then
+      echo -e "   [1] \033[37m\033[1ms=email\033[m"
+   else
+      echo -e "   [1] s=email"
+   fi
+   if [[ "*" = "${DEFAULT_SERVICE_TYPE}" ]] ; then
+      echo -e "   [2] \033[37m\033[1ms=*\033[m"
+   else
+      echo -e "   [2] s=*"
+   fi
+   if [[ "" = "${DEFAULT_SERVICE_TYPE}" ]] || [[ "none" = "${DEFAULT_SERVICE_TYPE,,}" ]]; then
+      echo -e "   [3] \033[37m\033[1mDo not include flag for Service Type\033[m"
+   else
+      echo -e "   [3] Do not include flag for Service Type"
+   fi
+
+   echo ""
+   echo "   Type a number or press <RETURN> to choose highlighted value"
+   echo ""
+   echononl "   Service type  [\033[37m\033[1m${DEFAULT_SERVICE_TYPE}\033[m]: "
+
+   while [[ "$SERVICE_TYPE" != "email" ]] \
+         &&  [[ "$SERVICE_TYPE" != "*" ]] \
+         &&  [[ "$SERVICE_TYPE" != "None" ]] ; do
+      read OPTION
+      case $OPTION in
+         1)    SERVICE_TYPE="s=email" ;;
+         2)    SERVICE_TYPE="s=*" ;;
+         3)    SERVICE_TYPE="None" ;;
+         '')   SERVICE_TYPE="${DEFAULT_SERVICE_TYPE}" ;;
+         *) echo ""
+            echo -e "         \033[33m\033[1mFalsche Eingabe ! [ 1 = s=email | 2 = s=* | 3 Omit Service Type ]\033[m"
+            echo ""
+            echononl "   Service type  [\033[37m\033[1m${DEFAULT_SERVICE_TYPE}\033[m]:"
+            ;;
+      esac
+   done
+
+
    echo ""
    echo -e "\033[32m--\033[m"
    echo ""
@@ -497,7 +545,11 @@ blank_line
 
 declare -i length_dkim_key=${#DKIM_KEY}
 
-_intro="v=${DKIM_TYPE}; k=${KEY_TYPE}; p="
+if [[ "${SERVICE_TYPE,,}" = "none" ]] ; then
+   _intro="v=${DKIM_TYPE}; k=${KEY_TYPE};"
+else
+   _intro="v=${DKIM_TYPE}; k=${KEY_TYPE}; s=${SERVICE_TYPE};"
+fi
 declare -i length_intro=${#_intro}
 
 declare -i total_length=$((length_intro + length_dkim_key))
@@ -527,17 +579,20 @@ if [[ ${total_length} -gt 255 ]] ; then
    done
    echo_done
 
-
-   txt_val="\"v=${DKIM_TYPE}; k=${KEY_TYPE}; s=email; p=\" ${p_val}"
+   # Note:
+   #     !! closing quotation marks are already included !!
+   #
+   txt_val="\"${_intro} p=\" ${p_val}"
 
 else
    echo_skipped
    p_val="${DKIM_KEY}"
-   txt_val="\"${_intro}${p_val}\""
+   txt_val="\"${_intro} p=${p_val}\""
 fi
 
 
 
+
 if $terminal ; then
    echo ""
    echo ""
@@ -560,6 +615,12 @@ if $terminal ; then
    echo ""
    echo "   DKIM Type........................: $DKIM_TYPE"
    echo "   Key Type.........................: $KEY_TYPE"
+   if [[ "${SERVICE_TYPE,,}" = "none" ]] ; then
+      echo -e "   Service Type.....................: \033[33m- Not set -\033[m"
+   else
+      echo "   Service Type.....................: ${SERVICE_TYPE}"
+   fi
+   echo ""
    echo "   DKIM Key.........................: $DKIM_KEY"
    echo -e "   \033[1m----------\033[m"
    echo ""