Click on edit by their username then you will have an option to [Send email to ____ ] and also [remove user]. What I did was set up a user group that does not have access to view or post. Instead of deleting them and having them register again, I just dump them into that user group so they can't register that username or if you have it set up right, they will not be able to register under that email address again.
Hope that helps!
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