The current multiuser setup grants the same (somewhat limited) permissions to all account users (except the account owner). Multiuser would be far more powerful, versatile, useful if it allowed more detailed permissions. List-specific permissions: Users can only send to certain lists. This would be beneficial, for example, when working with third-party developers and you only want them to be able to send to a test list, instead of spamming your production lists by mistake (or through malicious intent). Another case where it would be useful is limiting the scope for applications that connect to a user account, so that any bug or flaw in the app cannot affect any list(s) other than the one(s) specified. Feature-specific permissions: It would be handy if permissions included options for Email, Social Campaigns, Offers, EventSpot, Survey, etc., so that you could enable/disable each of those for each user. This could simplify the interface for those users, for example, or at least keep them from messing with features that are not authorized for them. Fine-grained selection of permissions: This would be useful, for example, to designate an accounts payable or purchasing agent user (they can access billing but nothing else); send-only users (they can send messages but cannot add/delete users); developer users (various permissions as needed); customer support users (can add/delete users, but cannot send messages); etc.
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