Smtp rejecting outgoing mail

Just started getting smtp rejecting mail. Server response from mail client: Server Configuration error. I tried to edit postfix/main.cf as the root, but get permissions denied.
At this point I cannot do anything, although terminal lets me log in as root.

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    This should help:
    http://osx.topicdesk.com/content/view/145/84/
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    That said, you should require all your clients to authenticate to send through your server.
    HTH,
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    Please put more light about your environment
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    I think I may have just figured out a part of this puzzle. I have more than just my att account set up in Mail. Even though all of my accounts are setup to use the ATT SMTP server only (with the appropriate ATT login info) I am getting the same rejection notices as everyone else.
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