Added OpenDKIM to Postfix module

SubModules/postfix/opendkim-init.sh

@@ -0,0 +1,35 @@
+if [ -n "$1" ]; then
+    if [[ "$1" = "--enable" ]]; then
+        echo "Enableing DKIM"
+
+        echo "*@DOMAINname vps._domainkey.DOMAINname >>/etc/opendkim/SigningTable\
+        systemctl reload opendkim
+        #Remove script
+        while true; do
+            read -p "Remove this script -> yes/no?" yn
+            case $yn in
+                [Nn]* )
+                break;;
+                [Yy]* )
+                rm -- "$0"
+                break;;
+                * )echo "Choose yes or no.";;
+            esac
+        done
+        exit
+    fi
+fi
+echo "Required to enable mailing for this system"
+echo "Please add the folloing to your SPF Record in the DNS of DOMAINname"
+echo ""
+echo "Optional to enable dkim" 
+echo "ip4:$(curl -s -4 icanhazip.com) ip6:$(curl -s -6 icanhazip.com)"
+echo "Please add the folloing TXT Record to the DNS of DOMAINname"
+echo "WARNING the output is split, please combine key before inserting into DNS" 
+cat /etc/opendkim/keys/DOMAINname/vps.txt
+
+echo ""
+echo "If DNS is propegated then run \"bash $0 --enable\""
+
+rm -f /etc/update-motd.d/51-opendkim-SITEName
+