Horde2 + exim returned mail goes to www-data

[Rodrigo Chandia <rchandia@lynqus.com.ve>]

Hello!

I have installed Horde + exim4 on Debian testing. Everything works fine
until a mail is returned by the exim server.

Such mails get returned to www-data instead of the user that sent the
mail.

Is there any way to fix it?

Regards,
-- 
Rodrigo Chandía