Mail.dll 3.0.22105.1207

IMAP

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

       imap.SelectInbox();
       List<long> uids = imap.Search(Flag.Unseen);
       foreach (long uid in uids)
       {
           var eml = imap.GetMessageByUID(uid);

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

           Console.WriteLine(email.Subject);
       }
       imap.Close();
}

POP3

using(Pop3 pop3 = new Pop3())
{
    pop3.Connect("pop3.server.com");  // or ConnectSSL for SSL/TLS     
    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);

        Console.WriteLine(email.Subject);
    }
    pop3.Close();
}