Peter L. Berghold:
> Hi folks, 
> 
> In pseudo code here's how I want my outside mail exchange system to
> behave: 
> 

On the Postfix server:

/etc/postfix/main.cf:
    smtpd_recipient_restrictions =
        permit_mynetworks
        permit_sasl_authenticated <- for the roaming laptop
        ...
        reject_unauth_destination
        ...

Then configure the Postfix server for SASL (to authenticate the
roaming laptop) and perhaps TLS encryption (to protect the login
sequence).

http://www.postfix.org/SASL_README.html#server_sasl
http://www.postfix.org/TLS_README.html#server_tls

        Wietse

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