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Compromised accounts are a problem. Even when I ask my users to use more complex passwords, they still occasionally get compromised. I would like the ability to limit what IPs can authenticate under a users account. Many users these days have static IPs, or they only authenticate from specific networks. For example. At home I have a static IP, and whatever dynamic IP my cell phone provider assigns me. Would be nice if I could tell smarter mail to only allow authentication under my user account if the connection comes from my static IP, or the network of my cell phone provider ( using RDNS to do the lookup ). I know this could take more effort on managing connections, as users who travel might need the limit disabled temporarly. But for maximizing security options especially for corporate environments, I think its a great idea.