Delay Warning messages

Hi all,
We are in the process of matching up postfix capabilities with qmail. We
use qmail-lagcheck to send queue delay warning messages to users at regular
back-off intervals (4h, 12h, 24h, 72h). I asked earlier and found out that
Postfix delay_warn sends one message at the first interval and that is it.
Is there a way to simulate the qmail-lagcheck and send multiple warnings?

I know the source says it sucks to get more useless mail in the first place,
but I thought I would ask. It seems to be important to some people around
here.:)

If not, I will see if there is a way to do it with an external script.

Thanks,
Bill Lewis