GroupWise messages to clients

Our company wants to be able to e-mail out a tip each month to a bunch of our clients. We’d like to make them part of a group, however, we don’t want the “To:” in GroupWise to list all the clients we have sent it to.

Is there any way to send a mass mailing but only have the one client listed in the “To:” box???? So they think they are the only special clients that received our e-mail?