[exim] rewrite "from" depending on "to" or recipient

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Lähettäjä: Hardy
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Vastaanottaja: exim-users
Aihe: [exim] rewrite "from" depending on "to" or recipient
Hi,

i want to create a mini mail-list just by putting some (externe) addresses into aliases.
on every post to "list@???" i want the sender to be rewritten to the same name "list@???" (not only reply-to).

is this easy to be done in exim.conf? how?

tia
Hardy