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Here are the few suggestions that I (and probably rest of the users) would like to have:
Campaign statistics showing time when email is open / clicked / unsubscribed (so we can decide when is the best time to send emails)
Clicking on user to see from which IP he has been subscribed and when (I believe timestamp is already in database)
Sent campaign tagging for users with different lists and niches but under same brand
Detection of member email client and reporting