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I really dont know how to start
nor have you given us anywhere near enough information to be able to help you work that out.
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The goal is to determine the accounts should be kept and those that should be removed
An admiral goal that will depend entirely on how and where the data is stored and its content, which you have not chosen to share with us
Please read the posting guidelines and be more specific. As things stand, you have not really told us anything about your problem
Edit after OP comment:
Here are a couple of starting points -
Sending emails over .NET framework, and general problems – using C# code[
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Reading Email from Inbox c#[
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