Postfix - how to limit send rate

Hi!

I have Debian Etch , with VHCS control panel installed.

I want to limit send rate from postfix email virtual users.

Is possible to set some rate limit or set some delay between sending emails from one email address?

Have someone any howto?

 

This might help: http://www.postfix.org/rate.html

 

It's no good for me, because there are only limits on number of mails to one recipient, but I need to control sender rate.