Re: [exim] Greylisting algorithms after end of DATA

On Sat, Jan 13, 2007 at 02:37:07PM +0100, Magnus Holmgren wrote:
> In fact, nothing prevents us from using an arbitrary set of header fields
> (such as Subject, Message-ID, From) in constructing the key, if it gives
> better confidence in what we want to know: whether the other end retries
> after a temporary failure. (We could even accept delivery and whitelist based

Identifying messages in this way is obviously in some
sense not adequate, since you can always put any
message-ID on any message; and some messages don't have
message-IDs at all. I don't know whether that level of
sophistication will matter versus the current behaviour of
spammers. If it does then looking at the kinds of hashes
that things like `Vipul's Razor' use is probably a good
idea.

--
``Odd things, animals.
Dogs look up to you. Cats look down to you.
Only pigs see you as an equal.'' (Churchill)