--On Sonntag, November 12, 2006 22:30:48 +0100 Alex van den Bogaerdt
<alex(_at_)ergens(_dot_)op(_dot_)het(_dot_)net> wrote:
On Sun, Nov 12, 2006 at 08:01:56PM +0100, Ralf Doeblitz wrote:
I don't think this would be the best solution. The exist mechanism
combined with macro expansion can almost do the job.
Sender: A
Forwarder: B
Forwarded-to: C
The problem:
A publishes an SPF record, authorizing only host A
B uses "MAIL FROM:<user(_at_)A>"
C tries to match host B in the SPF record of A.
How does your proposal work?
C uses a local whitelist prepended to the SPF record of A and can integrate
the whitelist specified by its own user. The extensions are only necessary
if you need to differenciate between multiple domains and/or serves on the
receiving end, otherwise the existing macro mechanism is sufficient.
Ralf Döblitz
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