Postfix -enviar pelo SMTP do Terra

Mr_Ciber
(usa CentOS)

Enviado em 03/02/2009 - 11:49h

Preciso fazer o Postfix enviar pelo SMTP do Terra (Relay).
Retorna erro.

This is the mail system at host mail.server.com.br.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<jonathan@servblu.com.br>: host smtp.terra.com.br[200.154.55.5] said: 550 Must
Authenticate! (in reply to MAIL FROM command)