Im not really clear on what the problem is, or what the email ID is you're mentioning? If you're saying that you have set a default reporter, and that incoming emails are not being created as that user, its possible you haven't allocated the 'default reporter' permissions in the 'default project'.
The two minute tutorial gets something going really quickly, try that:
A more complete tutorial for email user setup is:
Happy to Q&A here, but if you want to, feel free to log a support ticket in the dedicated JIRA project (free reg required)
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