Victor.Duchovnimorganstanley.com
Date: Sat Apr 17 2004 - 22:37:51 CDT

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On Sat, 17 Apr 2004, Wietse Venema wrote:

> This really needs an XCLIENT enabled proxy between fetchmail client
> and Postfix; the proxy would impersonate as the client listed in
> the ISP's Received header, and you could use all the built-in
> Postfix ACLs.
>

In Tony's case this can be done in his real-time SMTP proxy, with the
backend SMTP rejecting the client. He is not using fetchmail, his mail
is pushed on demand by his ISP using SMTP.

Suitable code in the proxy is quite simple, the key thing to ensure is
that the "XCLIENT ADDR=<extracted_ip>" command is only used for messages
that arrive from the ISP.

--
        Viktor.

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