[Exim] Repost: Problems with accentuated chars

I posted this message a few weeks ago and got no answer. Can't anybody give
my a clue??

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I recently migrated my mail serveur from Exim 3 to Exim 4. Everything seems
to work fine, except that *some* mails with accentuated chars seems to be
"converted" and all the accents are changed to garbage. I don't have any
rule to change the content of the messages (no spam detection or such), so
I'm puzzled...
Any idea on how I can investiguate this?

TIA

Greg