Electronic mail (email) is a widely used communication mechanism that can be categorized into two basic types of web-based service: an open web-based email service and a closed web-based service. The first category provides web-based email accounts to anyone for free or at a fee. The second category provides email accounts that are managed by organizations for employees, students, and members only. Commercial and social websites rely on the security of email accounts. Large amounts of email exchanges are occurring daily, some of which contain personal information, company secrets, and sensitive information. This makes email accounts very valuable and becomes one of the main causes of email hacking

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