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Use the DenyUsers option in /etc/ssh/sshd_config. See the sshd_config man page for details. Note that a user specified as "joe@example.com" will not prevent joe at example.com from logging in, but rather, it will prevent anyone from example.com logging in as the local user joe. At least, that is my understanding, I could be wrong.
Like everything Unix there is numerous ways to accomplish the same thing. What came to mind first for me is using the hosts.deny file. I set my hosts.deny to all:all. this blocks all users that are not explicitly allowed via the hosts.allow file. Yeah, you need both files if you do it that way. I'm guessing your running IPtables. Or you could just deny that one user in your hosts.deny file.
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