While this solution below will work for you principle, it will not allow others in the group the same courtesy to see who they are sending messages to.  It seems to me like all users should have this option.  If you use Lisa's method, all users could see exactly who they are sending to without making everyone a manager.

On Mon, Jan 30, 2012 at 11:37 AM, Susan Briere <[log in to unmask]> wrote:
Relatively low risk solution:

..changing the Principal's domain group membership to Manager did the trick for making the group members accessible.

Thanks to Lisa for confirming the answer.

On Mon, Jan 30, 2012 at 11:04 AM, Susan Briere <[log in to unmask]> wrote:
Would like to confirm the following change in Apps Mail:

In the past when an email was sent to a "domain" group address (as opposed to a user-managed group) the individual email addresses of the group members displayed in the sent message. That doesn't appear to be the case any longer, as the only address listed is group's email address.

... and I 'd like to ask for your input on this:

We create a group for each school at the domain level and maintain membership in the domain groups for the schools. A Principal was checking a recently sent message to see if the member list was current, and was unable to view members' addresses. I was asked if there's a way for a user with non-elevated privileges to view the member list of  domain group?

Thanks in advance,
Susan Briere
Technical Support, RNESU

Mary Micklas
Educational Technologist
Beeman Elementary School
50 North Street
New Haven, VT 05472
(802) 453-2331 x213