问Asp.net身份确认邮件将发送到垃圾邮件%1

EN

   public Task SendAsync(IdentityMessage message)
        {            
            string html = message.Body;
            string plain = message.Body;
            MailMessage msg = new MailMessage();
            msg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(html, new ContentType("text/html")));
            msg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(plain, new ContentType("text/plain")));
            msg.From = new MailAddress("no-reply@leavingstone.net", "nebula");
            msg.To.Add(message.Destination);
            msg.IsBodyHtml = true;
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.Subject = "აქტივაცია";

            new SmtpClient("smtp.mandrillapp.com")
            {
                Port = 25,
                Credentials = ((ICredentialsByHost)new NetworkCredential("xxx"))
            }.Send(msg);

            return Task.FromResult(0);
        }