Exchange 2010

We are looking for a way to prevent users from expanding the distribution group and then deleting users or hiding an individual email address inside the distribution group.
colmisdivAsked:
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tshearonCommented:
Are these individuals group managers of the distribution groups? This should not happen by default.
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colmisdivAuthor Commented:
No they are not. In fact the email address being removed is a group manager for the group.
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tshearonCommented:
Well you could always use message moderation and have the E-Mail checked by the moderator/manager of that group. Or you could hide the distribution list. The last option would be to limit who can send to the list but I am not sure if that is a realistic option for you.
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Gareth GudgerCommented:
Yep its by design that you can expand (enumerate) a distribution group. Once its enumerated in Outlook, its as if they had just added all users individually. So they can add or remove whoever they like at that points.

There are workarounds to this. In previous versions of Exchange you could "hide" distribution group members. Not sure that's feasible in 2010 any more.

This article claims a workaround is to convert it to a Dynamic Distribution Group instead. Which sort of makes sense. I may have to try this out in my lab later.
http://alashcroft.wordpress.com/2012/04/03/hiding-distribution-group-membership-exchange-2010/
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