SmtpClient client = new SmtpClient
{
    Port = 587,
    DeliveryMethod = SmtpDeliveryMethod.Network,
    EnableSsl = true,
    Host = "smtp.gmail.com",
    Credentials = new NetworkCredential
    {
        UserName = "someuser@gamil.com",
        Password = "passwordforsomeuser"
    }
};

var msg = new MailMessage();
msg.Body = "testing body";
msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
msg.From = new MailAddress("fromEailAdd");
msg.To.Add(new MailAddress("toEmailAdd"));
msg.Subject = "test subject";
msg.SubjectEncoding = Encoding.UTF8;
msg.BodyEncoding = Encoding.UTF8;

client.Send(msg);