Hello Andhy,

It is not actually Postfix who does the authentication, but other apps
+ SASL. You should check this URL (http://www.postfix.org/
SASL_README.html)

I've implemented it using CentOS 5 using the very same guide. Works
like a charm.

On Mar 31, 10:32 pm, Andhu <aravind.arju...@gmail.com> wrote:
> hi,
>
> anyone plz guide me how to configure smtp authentication in postfix in
> RHEL 4.0 operating system.