public static void Run()
        {
            // ExStart:RetrieveMessageSummaryInformationUsingUniqueId
            string uniqueId = "unique id of a message from server";
            Pop3Client client = new Pop3Client("host.domain.com", 456, "username", "password");
            client.SecurityOptions = SecurityOptions.Auto;
            Pop3MessageInfo messageInfo = client.GetMessageInfo(uniqueId);

            if (messageInfo != null)
            {
                Console.WriteLine(messageInfo.Subject);
                Console.WriteLine(messageInfo.Date);
            }
            // ExEnd:RetrieveMessageSummaryInformationUsingUniqueId
        }
        public static void Run()
        {
            // ExStart:RetrieveMessageSummaryInformationUsingUniqueId
            string     uniqueId = "unique id of a message from server";
            Pop3Client client   = new Pop3Client("host.domain.com", 456, "username", "password");

            client.SecurityOptions = SecurityOptions.Auto;
            Pop3MessageInfo messageInfo = client.GetMessageInfo(uniqueId);

            if (messageInfo != null)
            {
                Console.WriteLine(messageInfo.Subject);
                Console.WriteLine(messageInfo.Date);
            }
            // ExEnd:RetrieveMessageSummaryInformationUsingUniqueId
        }