mail rate limit problems

Hi all,

I am using mail rate limiting to prevent spam and so...

The problem is when its on, wordpress password reset mails are also being limited.

It seems default mail account also being limited (root?) and root account cant send mails too...

What is the correct usage for mail rate limiting, preventing spam for sending from our server ? Spamassasin prevents outside spammers but how can we solve it on our side ?

For example force mail credentials for sending mail from server ? Prevent relay and so on ...

Thanks