One senario I encountered was that you cannot send a PM to yourself; i.e. if you trip the detector with the account you are sending your alerts to, the PM will not get sent. And since you only get one PM per addition of new accounts, you won't see subsequent logins on those two accounts.
If you didn't catch that - you only get one PM per violation - meaning if A and B login on the same computer you only get one notice until that computer registers a C login.
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