Re: [Exim] Checking against "seen" Message-ID:'s to drop bou…

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Autor: Peter Bowyer
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A: exim-users
Assumpte: Re: [Exim] Checking against "seen" Message-ID:'s to drop bounces
Russell King said:
> On Mon, Jul 12, 2004 at 02:20:12PM +0200, Tor Houghton wrote:
>> So; we thought that one way of cutting down the human processing time of
>> such messages would be to somehow record and check the
>> bounced/undelivered
>> message's ID. Perhaps this is old news, has been thought of before and
>> was
>> rejected as a bad idea.
>
> I think you'll be lucky to find the original message ID in a bounce
> message. You're already lucky if you can parse the intended
> recipients from bounces let alone work out which message it
> corresponds with.


Agreed 100%.

Some people here have discussed an alternative solution which drops a
cryptographically-derived cookie in the return-path of all outgoing mail,
and on the incoming side you reject null-sender mail which arrives to the
'bare' address, and verify the cookie otherwise.

ie

mail sent by peter@???
return-path rewritten to peter-<cookie>@example.com

bounce arrives to peter@??? - reject.
bounce to peter-<cookie>@example.com - if the cookie verifies, accept and
deliver to peter@???, else reject.

Methods of deriving the cookie probably involve the a timestamp and other
things.

Peter