ya thanks, i resolved that issue,thanks for our reply

Noel Vargas wrote:
> Andhu, check this:
> http://www.postfix.org/SASL_README.html#server_sasl
>
> Seems to me that you're allowing your LAN to send email without
> authentication. Check if you have something like this:
>
> smtpd_recipient_restrictions =
> permit_mynetworks
> permit_sasl_authenticated
> reject_unauth_destination
>
> Remove permit_mynetworks