[Exim] Pb to write filter

Hello,

I trted all the week-end to write a filter to send a specific mail to two
address...
I would to send mails which arrive into the server to toto@??? (toto is
a local user and domain.com a local domain) to the normal recipient but to a
second recipient too (ie titi@???).
I would like to do the reverse too (send two mails, one to the real recipient
and a copy to another user, when mail with the from header has
"toto@???")...

If you can help me..

Regards,
--
E.Bullier