Bounce messages also to local domains

Hi!

We have an exim4 acting as our mail server in "mail.foo.org". Our mailboxes are "me@foo.org", "you@foo.org". We configured in /etc/valiases/foo.org the catch-all for that domain as ":fail: Unknown recipient".

Well, when someone at "someone@gmail.com" sends a mail to "noone@foo.org", he/she receives a bounced message with the SMTP error in his/her mailbox at gmail, but when "you@foo.org" sends a mail to "noone@foo.org" the mail client (Outlook, Thunderbird, etc) doesn't send the mail, showing the SMTP error in the cilent itself.

What we want is the same behaviour that the one with non-local domains. So, we want messages to "noone@foo.org" to be bouced if they are sent by a local-domain user or a non-local one.

Any idea?

Thanks in advance (and sorry about my English