Andhu wrote:
>
> But when i de-select the option in Outlook ie. my outgoing(SMTP)
> server requires authentication.
> its not asking for password so that any user can send mail to my
> mailserver.

I guess "any user within $my_networks" can send mail (not from
outside). If you really want to disable this, you'll have to
replace "permit_mynetworks" by "permit_sasl_authenticated"
(somewhere in main.cf, probably at "smtpd_recipient_restrictions".

-Matt