public void Sender()
{
MailMessage mail = new MailMessage();
mail.To.Add("yoonhada@gmail.com");
mail.Subject = "Test Mail";
mail.Body = "This is for testing SMTP mail for GMAIL";
//Attachment attachment = new Attachment("d:\\001.jpg");
//mail.Attachments.Add(attachment);
LinkedResource LinkedImage = new LinkedResource(@"d:\\001.jpg");
LinkedImage.ContentId = "MyPic";
AlternateView htmlView = AlternateView.CreateAlternateViewFromString("You should see image next to this line. <img src=cid:MyPic>", null, "text/html");
htmlView.LinkedResources.Add(LinkedImage);
mail.AlternateViews.Add(htmlView);
SmtpClient smtpServer = new SmtpClient("smtp.gmail.com");
smtpServer.Port = 587;
smtpServer.Credentials = new System.Net.NetworkCredential("AAAAAAAAA@gmail.com", "AAAAAAAAAAAAA") as ICredentialsByHost;
smtpServer.EnableSsl = true;
ServicePointManager.ServerCertificateValidationCallback = delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{ return true; };
smtpServer.Send(mail);
Debug.Log("success");
}