added CMSHook for postfix module and updated conf

CMSHook wil be inplemented so CMS releated Module configuration,
this wil be loaded when using appendCMS and the main intaller

SubModules/postfix/CMSHook-preconf.sh

@@ -0,0 +1,27 @@
+if [ -z "${sitename}" ]; then sitename=${domain//./_};fi
+if [ $IMODE = n ]; then
+    if (whiptail --title "Config" --yesno "                          Send mail as info@$domain of $domain" 11 78); then
+    mailas=info@$domain
+    maildomain=$domain
+else
+    mailas=$(whiptail --nocancel --inputbox "                                 Enter mail addres for sending mail" 11 78 --title "Config" 3>&1 1>&2 2>&3)
+    sed -e 's/[^@]*@//' <<< "$mail"
+fi
+
+fi
+if [ $IMODE = l ]; then
+    while true; do
+        read -p "Hostname with nxdi.nl -> yes/no?" yn
+        case $yn in
+            [Yy]* )
+                mailas=info@$domain
+                maildomain=$domain
+            break;;            
+            [Nn]* )
+            echo 'Enter full hostname:'
+            read hostname
+            break;;
+            * )echo "Choose yes or no.";;
+        esac
+    done
+fi