spf-discuss
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Re: New macro proposed %{u}

2004-02-02 10:13:25
Dan Boresjo wrote:
Synopsis:
The %{u} macro expands to the username returned from an ident query performed on the incoming connection.

Dan -

I find the "explanation" that followed very confusing; you state above that the macro expands to a username, and then later that it expands to a uid or pid, and you provide no use cases. Likewise you start off involving identd and then appear to discard it (generally the appropriate action for identd, I've found).

Do you expect this to be used in an exists: or a: rule, or what type? Please give examples.

As best I understand it you expect webservers to be able to interrogate the DNS of a submitted email address to find out whether the REMOTE_IP/REMOTE_PORT combination of an http session is legal for a given user? (ok, so I don't understand it, I suspect). How is this IP/PORT combination specified or returned?

Further this appears to have absolutely nothing to do with the core purpose of SPF, which is to validate mail-sending machines.

Unless you can clarify the above points and explain in detail the network mechanisms that allow a meaningful expansion of your macro, I have to oppose it on the grounds of complexity and apparent irrelevance. It is unclear and can only confuse the purpose of SPF and hamper adoption.

Thanks,
        Wechsler

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