smtp authentication configuration

Hi to all,
I'd like to configure xmail SMTP authentication in this way:
- connections from localhost do not need authentication
- connections from internet need authentication

Now my SMTP listens only in localhost.

In file SMTP.IPMAP.TAB I have to allow external connections, and that's ok.
In file SMTPAUTH.TAB I have to specify SMTP users and permissions.

I cannot find in the documentation any other hints about my desired 
configuration.

Some hints?

Thanks in advice.

regards
Marcello

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