// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
SmtpClient client = new SmtpClient("smtp.gmail.com", "user@gmail.com", "password");
client.SecurityOptions = SecurityOptions.SSLExplicit;
client.Port = 587;

try
{
    string[] caps = client.GetCapabilities();

    foreach (string str in caps)
        Console.WriteLine(str);
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}