Open Dmarc + Cron queue (postfix)

Hi,
I would like to implement Open Dkim on my server but I don't want to broke postfix..
Actually there is some filter like RBL, SPF..

And second thinks, I would like to prevent my server to be a source of spam; for this.. I've an idea but don't know if it's possible and how to do it..

So, it should be a cron, this One check the queue (postfix) and if queue > X then I disable the account..

But how to do that?

Thanks !!!

 

For DKIM is easy, you only have to install this patch: http://blog.schaal-24.de/ispconfig/dkim-patch-1-0/?lang=en

For the spam thing, I have a script running every hour that mails me if there are more than 20 mails on queue:

PHP:

#!/bin/sh
correo='[email protected]' # your mail
limite=20 # when queue reach this limit it mails you
cola=$(mailq | grep -c "^[A-Z0-9]")
echo $cola' mails on queue' > /tmp/cola.txt
if [ "$cola" -ge "$limite" ]; then
mail -s "ALERT: $cola mails on queue" $correo < /tmp/cola.txt
fi