Samah:
We are using OM V8 and I am not aware of how to indicate a BCC using a Notification object. However we use the following method to send notifications to our users that are not logged on or do not have a UC4 userid.
We create UC4 Users for the sole purpose of sending an email message from a Notification object. Those users have no privileges and are not members of any User Group. Should someone successfully to logon to with one of these users they would experience message U0000009 'object': Access denied with any attempt to access an object.
The Email1 attribute is the address associated with our paging system and the Email2 attribute is the address of an Outlook distribution list (using the smtp:some_list value in its E-mail Addresses tab). It is the list owner’s responsibility to maintain its addressees. The Notification object uses this User in its Recipients tab. This technique works reliably for our UC4 related notifications as it depends on Outlook to actually distribute the message to all of the users in the list and does not require any type of UC4 coordination.
Perhaps this will be sufficient to address your needs.