[exim] Rewrite Reply-To dependent on another header

Hi all,

Re-sending this as it didn't appear to make it to the list, apologies if
anyone gets it twice !

I am a member of an email mailing list that's list owner insists on
setting the reply address back to the original sender rather than the
more conventional reply to the list.

So what I would like to do is insert a Reply-To: header that by default
sends replies back to the list. There are other headers that I can use
to identify the list messages, so that I only re-write the correct
messages, infact one of the headers the list software inserts, has the
address of the list.

I know the correct way to get this fixed is to convince the list admin
to change things but they seem adamant that this is the best way of
doing things despite the fact that I get the feeling most of the4 list
members don't.

Cheers.

Phill.