Sending Email with template using Gmail Credentials - c#-4.0

Question

Hi i am trying to send an email using gmail credentials and calling an email template but it is throwing an exception that Failure sending mail
SmtpClient SmtpServer = new SmtpClient();
SmtpServer.Credentials = new System.Net.NetworkCredential("ambarishkesavarapu#gmail.com", "xxxxxx");
SmtpServer.Port = 587;
SmtpServer.Host = "smtp.gmail.com";
SmtpServer.EnableSsl = true;
message = new MailMessage();
message.Subject = "Visitor Arrived";
message.SubjectEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = false;
message.Body = "EmailTemplate.html";
message.BodyEncoding = System.Text.Encoding.UTF8;
message.From = new MailAddress("ambarishkesavarapu#gmail.com");
message.To.Add(lblCPEmail.Text);
message.Priority = MailPriority.High;
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
SmtpServer.Send(message);
Please help me out.

Answer 1

You have to use StreamReader to read from html file....and also set the MailMessage.BodyFormat property to MailFormat.Html
Use This:
SmtpClient SmtpServer = new SmtpClient();
SmtpServer.Credentials = new System.Net.NetworkCredential("ambarishkesavarapu#gmail.com", "xxxxxx");
SmtpServer.Port = 587;
SmtpServer.Host = "smtp.gmail.com";
SmtpServer.EnableSsl = true;
using (StreamReader reader = File.OpenText(htmlFilePath)) // Path to your
{ // HTML file
message = new MailMessage();
message.Subject = "Visitor Arrived";
message.SubjectEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = false;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.From = new MailAddress("ambarishkesavarapu#gmail.com");
message.To.Add(lblCPEmail.Text);
message.Priority = MailPriority.High;
message.Body = reader.ReadToEnd(); // Load the content from your file...
//...
}
SmtpServer.Send(message);
Answer partially taken from Send a email with a HTML file as body (C#)

Answer 2

use port 465 instead
Port 465 is for smtps
SSL encryption is started automatically before any SMTP level communication.
Port 587 is for msa
It is almost like standard SMTP port. MSA should accept email after authentication (e.g. after SMTP AUTH). It helps to stop outgoing spam when netmasters of DUL ranges can block outgoing connections to SMTP port (port 25).

Answer 3

foreach (GnrDataMailInfo dmi in lstDMI)
{
MailMessage mail = new MailMessage();
mail.From = "youremail";
SmtpClient smtp = new SmtpClient();
smtp.Port = 25; // [1] port
smtp.EnableSsl = true;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network; // [2] Added this
smtp.UseDefaultCredentials = false; // [3] Changed this
smtp.Credentials = new NetworkCredential(mail.From.ToString(), "password"); // [4] Added this.
smtp.EnableSsl = false;
smtp.Timeout = 20000;
smtp.Host = "yourhost";
mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
mail.BodyEncoding = System.Text.Encoding.UTF8;
mail.HeadersEncoding = System.Text.Encoding.UTF8;
mail.Subject = dmi.Subject;
mail.To.Add(dmi.To);
mail.IsBodyHtml = true;
mail.Body = dmi.Body;
smtp.Send(mail);
}