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  SmtpClient Smtp = new SmtpClient("smtp.mail.ru", 465);
  Smtp.Credentials = new NetworkCredential("login@mail.ru", "Passwords");
  Smtp.EnableSsl = true;
 
  //Формирование письма
  MailMessage Message = new MailMessage();
  Message.From = new MailAddress("login@mail.ru");
  Message.To.Add(new MailAddress(mailTo));
  Message.Subject = "asdas";
  Message.Body = "asd asdas";
  Smtp.Send(Message);

try
{
    MailMessage mess = new MailMessage();
    mess.To.Add(to);
    mess.From = new MailAddress(from);
    mess.Subject = subject;
    mess.Body = body;
    SmtpClient client = new SmtpClient();
    client.Host = "smtp.mail.ru";
    client.Port = 587;
    client.EnableSsl = true;
    client.Credentials = new NetworkCredential(from.Split('@')[0], pass);
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.Send(mess);
    mess.Dispose();
}
catch (Exception e)
{
    throw new Exception("Mail.Send: " + e.Message);
}