Maximum smtp process limit has been reached.

Hi,

I'm struggling with new SMTP server and I noticed that sometimes it just 
hangs because of:

Jul  2 14:14:21 smtp postfix/master[17716]: warning: service "smtp" (25) 
has reached its process limit "50": new clients may experience 
noticeable delays
Jul  2 14:15:06 smtp postfix/master[17716]: warning: to avoid this 
condition, increase the process count in master.cf or reduce the service 
time per client

The problem is when it happens I can't do nothing just reload postfix. 
Is there any way to sort it out ? I increased that value now, but for me 
it's not solving my problem because instead of increasing that I would 
rather like to postfix struggles with with on its own somehow by reload 
configuration or ... I don't know.
Maybe is there any timeout to setup, because after that when I took a 
look at netstat it showed me a lot of connections from 127.0.0.1 
(greylisting daemon).

Thank you for any help in advance.

Regards,
Jarek