smtp auth for every user

[Alex Potter]

On Monday 29 Mar 2010 07:41:55 balwant singh wrote:
> > thanks alex,  i did this.
> 

> but my question is that every mail we are sending, the kolab server should
> check whether the mail is coming from the correct userid & password.

Have you told postfix that it must authenticate local users? 
If you show us your main.cf we may understand why you are having a problem.

Alex