On Wed, Mar 4, 2009 at 10:51 AM, Md. Ruhul Amin <tuhin_cse99@...> wrote:
> Hi guys,
>              I have installed postfix and dovecot in my centos5.X system.
>            I can send mail to the user in my group but can not send mail to
> any other domain

By group you mean a domain or mailing list or ___?


>            When I want to send mail error occured,..Relay access denied
>             What should I do to avoid SMTP Authentication?
>             I just   follow http://wiki.centos.org/HowTos/postfix


There is no authentication as such, either the domain dint resolve or
some firewall is blocking.


>
>    here is my
>   $>postconf -n
>

Hope you tried this in your machine which is not configured mail
gateway. Any of the mail server on install should work out of the box
and your configuration looks perfectly fine to me.


--
regards,
Prashanth