Fala Pessoal, blz?
 To com um problema aqui, quando eu tenho um alias que dentro dele possuem
mais de 10 membros, muitas vezes estes e-mails não chegam ao destinatário e
aparece este erro:

-------- Mensagem original --------
Assunto:     Undelivered Mail Returned to Sender
Data:     Thu, 3 Apr 2008 11:52:41 -0300 (BRT)
De:     [EMAIL PROTECTED] (Mail Delivery System)
Para:     [EMAIL PROTECTED]


This is the Postfix program at host mail.dominio.

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 Postfix program

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid
    user specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid
    user specified.

<[EMAIL PROTECTED]>: user unknown. Command output:
    Invalid user specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.


<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user specified.

<[EMAIL PROTECTED]>: user unknown. Command output: Invalid user
    specified.

<[EMAIL PROTECTED]>: user unknown. Command output:
    Invalid user specified.


Já pesquisei em tudo que é canto ai e nada :(

Alguém já teve este problema?

Abraços

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