This is your example code. How to connect to gmail.

private void DoMethod ()
    {
        bool connecting = false;
        Exception error;
        try
        {
            if (_pop.State == Pop3State.Disconnected)
            {
                connecting = true;

                // Get configuration.
                string server = _config.GetString("server");
                int port = _config.GetInt32("port");
                string userName = _config.GetString("userName");
                string password = _config.GetString("password");

                SetStatus(string.Format("Connecting to {0}...", server));

                // Forget the old message list.
                _messageList = null;

                // Connect to the server.
                _pop.Connect(server, port);
                _pop.Login(userName, password);

                connecting = false;
            }

            // Run desired background operation.
            _method ();

            error = null;
        }
        catch (Exception x)
        {

            Pop3Exception px = x as Pop3Exception;
            if (px != null && px.Status == Pop3ExceptionStatus.OperationAborted)
            {
                // If the operation is a result of an abort, don't report it as error.
                error = null;
                _pop.Disconnect();
            }
            else
            {
                error = x;

                // If this is a failed connection attempt, disconnect.
                if (connecting)
                    _pop.Disconnect();
            }
        }
        finally
        {
            _thread = null;
        }

        // Resets status bar and informs the main form that the operation finished.
        SetStatus("");
        if (_callback != null)
            _owner.SafeInvoke(_callback, new object[] {error});
    }

when i tried to connect with trial version of Rebex mail i do this succeed with this code:

// connect and log in Pop3 client = new Pop3(); client.Connect("pop.gmail.com", 995, null, Pop3Security.Implicit); client.Login(email, password);

// process messagess...

// logount and disconnect client.Disconnect();

after i purchased the normal version. i don't have this method: client.Connect("pop.gmail.com", 995, null, Pop3Security.Implicit);

i have only this: // Connect to the server. _pop.Connect(server, port);

and i think that gmail need secure connection.

please help me connect to gmail.