[Exim] Condition question

Hi,

How would i go about denying access to a specific authenticated user ?


would this work ?

accept authenticated = *
         message = Authenticated user must match sender!
         endpass
         condition = ${if eq{$authenticated_id}{$sender_address}{yes}{no}}
         condition = ${if !eq{$authenicared_id}{not@???}{yes}{no}}
         verify = sender

is it case sensitive ?

Thanks,
Oren