Being able to click on the number of constituents in the group summary categories and see a list of specific constituents would be useful to better understand the make up of different groups, especially around soft and hard bounces, and opt-outs. Seeing a report or list of opt-outs would especially be helpful to know who in a specific group is not receiving a message, especially if you're highly segmenting your messages.

This is a common feature among other email marketing systems.

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