I have a problem. I have this error message:

refused to talk to me: 421 mwinf8503 ME Trop de connexions, veuillez verifier votre configuration. Too many connections, slow down. LPN007_104 [104])

I want to configure this but I don't know where can I configure this. Directly, in /opt/zimbra/postfix/conf ?

Normally, in transport, main.cf and master.cf but when I read the "ADMIN GUIDE" at page 47, it's say :
Important: Do not modify the Postfix configuration files! Changes you make will be overwritten

Anyone know how or a track?

thanks you