Rob Tanner:
> Is it possible to use Postfix as a client to an upstream server?
> And by a client I mean, can Postfix use auth SMTP to authenticate
> to that upstream server and can it use STARTTLS while acting like
> a client to the upstream server?
>
> If any of the above questions are "yes" i there specific documentation
> or a how to available anywhere on the net?

Yes. 

http://www.postfix.org/SOHO_README.html
http://www.postfix.org/SASL_README.html
http://www.postfix.org/TLS_README.html

        Wietse

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