-----Original Message-----
From: Stuart D. Gathman [mailto:stuart(_at_)bmsi(_dot_)com]
Sent: woensdag 9 januari 2008 12:00
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
Subject: Re: [spf-discuss] Re: Forwarder whitelisting counter-proposal: SPF
"i-am=" modifier
Since you don't immediately know the forwarder domain of a non-SRS
forwarder, you have to search. A simple linear search is inefficient
when the list is large. So, a hint as to what the forwarder domain
might be would be easier than tricky programming to efficiently search
the forwarder list given an IP (convert each SPF record to a set of IPs
and search those). But if the forwarder is nice enough to do that, why
not just use SRS? Also, ENVID could contain the hint, as someone
suggested.
I still think SRS is the way to go.
As for ENVID containing the hint, I don't see why not (as I suggested
earlier). At least I would prefer using it over a new AUTH parameter.
There's no RFC mandating ENVID contain any specific content (other than
that it be limited to 100 chars, I believe).
- Mark
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