11 is a lot for a simple configuration error. There could be multiple factors in play. This could be due to any combination of the following:
Are you to only user experiencing this issue? Is this a one-time thing, or does it occur all the time? Is it always 11 emails, or does the number vary? By how much? Are all the emails from the same sender?
Answering these questions will probably help you figure out what's wrong.
In any case, there's probably email server stuff that's not configured properly. It would take a very malicious admin to set up JIRA notifications to send 11 emails for the same event.
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