Put the group in the Bcc: line
Blind Carbon Copy

View | All Headers in the message window.

I would suggest putting your email address in the To line to keep the
Undisclosed Recipients from showing instead which may be filtered upon.


"AlanTheBeginner" wrote in message
...
I know how to create group member via Address Book and then make member
selection. Since security comes first, I want to hide members' email
addresses as I distribute postings to them.

For example, when one of the group members open the posting from
distribution, she will see the member list in the group and press
properties to find their email addresses.

Is it possible to show the member list while hiding their email addresses?