How to auth the local user with postfix

Hi, I'm using Postifx 2.2.8 with SASL based on FC4, everything works fine except one thing, as you know, when we send an email from OE, or Kmail, etc... to outside world such as yahoo,
we have to type our password to authenticate, and then if our password are right, our mail can be sent, but I don't know the reason why if I send to a local user, example, my account is a@example.com send to b@example.com, mail server didn't require to me to input the password, I want to be prompted for password before sending an email to local user, could you help me resolve this situation ?

Thanks in advance !

Sincerely.

thienannt

 

 

 

 

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