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Today, e-mail is one of the most popular communication facilities. E-mail List Service (ELS) is a useful facility for scientific, commercial and social user groups. The main concern about ELS is how to manage and control the access of different users. To secure ELS by using security protocols and encryption/decryption mechanisms as well as user authentication, the computational overhead of servers will increase considerably. In addition, these methods do not offer adequate mechanism for entrance and subscription of users.
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