Re: [Exim] Matching bounce recipients against sender hashes

On Jun 11, 2004, at 03:08, Tony Finch wrote:
> What you want to do is create the signed sender address with something
> like
>
> $local_part+$message_id.${hmac{md5}{SECRET}{$local_part+$message_id}}@$
> domain

> ${if and{{ match{$local_part}{^([^.]*)} }
>          { eq{$local_part}
>              {$1.${hmac{md5}{SECRET}{$1}}} }}
>      {ok} {bad} }

Brilliant!
(Why didn't I think of that?)

As you say, my challenge will be getting the timestamp out of the
$message_id; however that's only a challenge, not an impossibility. :)

Thanks!
-tor