Author: David Woodhouse Date: To: Peter Bowyer CC: exim-users Subject: Re: [Exim] Checking against "seen" Message-ID:'s to drop bounces
On Mon, 2004-07-12 at 12:55 +0000, Peter Bowyer wrote: > 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.
