At 12:16 PM 2/1/2008 +0100, Alessandro Vesely wrote:
David MacQuigg wrote:
Requirements for Solution to Forwarding Problems
1) Use IP-based authentication (signatures are a separate topic)
In this fix-forwarding tentative solution (hereafter FF) we might use
user/password authentication, where "user" is the above FQDN and "passwords"
are generated by the granting host.
Good point. As a Recipient, my own forwarding arrangements involve only
password authentication. My Forwarders have no direct relationship with my
MDA. To make changes at any of these Agents, I sign in with a password.
I should have said something like - if authentication is necessary, use
something simple. I deleted this requirement from the list, since the valid
parts are implicit in the other requirements. What I was really trying to say
was let's not get involved in discussing solutions far outside the scope of
this group, as the details of signature-based methods would certainly be.
FF requires a database with <forwarder, envelope recipient> tuples. Obviously,
the Recipient already has an envelope-recipient database: It will be
multiplied by a number of Forwarders who have the corresponding forwarding
configuration. On average, the resulting figure could match the number of
forwarding recipes that a Forwarder already stores for the envelope recipients
in its own database. However, that may be a problem in some cases.
Even if it represents an additional cost, that data is needed for
privacy-compliant forwarding - the problem I state below and that is missing
from http://open-mail.org/Forwarding.html
Problem P - It is a mess to keep track of forwarding chains, let alone
updating any of those nodes.
Maybe we could re-state this more clearly as: Problem P - Recipients have
difficulty keeping track of and updating their forwarding arrangements. I
added that to our Statement of Forwarding Problems at the link above, with a
note "still needing discussion".
-- Dave
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