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how to fetch all mail from beginning to end by pop3 mail either it may be read or unread

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Code is quite simple:

using(Pop3 pop3 = new Pop3())
{
    pop3.Connect("pop3.server.com");  // or ConnectSSL for SSL      
    pop3.UseBestLogin("user", "password");

    List<string> uids = pop3.GetAll();
    foreach (string uid in uids)
    {
        var eml = pop3.GetMessageByUID(uid);

        IMail email = new MailBuilder().CreateFromEml(eml);

        string subject = email.Subject;
    }
    pop3.Close();
}           

Now, depending on your server and your server configuration, not all emails might be returned.

For example in Gmail, you can enable POP3 for all messages -or- only for mail that arrives from now on.

Take a look at Gmail's POP3 behavior here:
https://www.limilabs.com/blog/gmail-pop3-behavior

Some servers may limit the amount of messages they return.
Consider using IMAP protocol, IMAP is usually not affected by such limits.

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