[Exim] The use of SMTP forward

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Lähettäjä: Erik Johansson
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Vastaanottaja: Exim list
Aihe: [Exim] The use of SMTP forward
I recently read about SMTP forwarding, RFC821 section 3.2, is this
possible to do with exim.

It's these responses I'm interested in. (from RFC)

R: 251 User not local; will forward to <Postel@???>
R: 551 User not local; please try <Mockapetris@???>

Did a search of the manual and couldn't find anything?