[debiancolombia] servidor de correo

[jaime paternina paternina]

 buenas,segi los paso de este link para montar un servidor de correo

http://www.linuxsilo.net/articles/postfix.html#squirrelmail

hora tengo 2 preguntas y problema

preguntas

1)cuando quiera crear un usuario nuevo como hago???
2)donde esta lo de las Suscripciones????

problemas

1)recibo los correos perfectamente, pero al enviarlos me sale el siguiente
error:

This is the mail system at host mail.pruebas.servebeer.com.

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

<jepr.88 en gmail.com
<http://pruebas.servebeer.com/squirrelmail/src/compose.php?send_to=jepr.88%40gmail.com>>:
host gmail-smtp-in.l.google.com[209.85.133.114] said:
    550-5.7.1 [201.244.96.196] The IP you're using to send email is not
    authorized  550-5.7.1 to send email directly to our servers. Please use
    550 5.7.1 the SMTP relay at your service provider instead. d19si7942745and
    (in reply to end of DATA command)




gracias de antemano
espero su prontas respuestas
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