>Is there a way to set some user accounts to
>only send and receive mail traffic within our domain ?

you mean to keep

MAIL FROM: localsender@ourdomain

.. msgs from leaking to Internet?  I don't know of any way to that with IMail.

What's your objective?  Cleaver users can setup anyname@anydomain, and 
relay through Imail to Internet, even if Imail could block 
localsender@ourdomain, and esp if you have "relay for addressess".

Yet again, this kind of filtering can be done with IMGate, where the parameter

check_sender_access somefilter

will reject all

MAIL FROM: localsender@ourdomain

Len


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