Question

I am trying to send email using gmail from my mvc application. I am getting the following exception

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

here is the code for sending email

string tn = "EmailVerification.htm";
string fileName = Path.GetFileName(tn);
string templatePath = Path.Combine(Path.Combine(System.Web.HttpContext.Current.Server.MapPath("~/EmailTemplates")), fileName);
  System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();

            mailMessage.From = new MailAddress(EmailFrom, "Email");
            mailMessage.To.Add(new MailAddress(To));
            mailMessage.Subject = "subject";
            mailMessage.IsBodyHtml = true;
            MailDefinition mailDef = new MailDefinition();
            mailDef.BodyFileName = templatePath;
            mailDef.IsBodyHtml = true;
            mailDef.Subject = "mailDefsubject";
            mailDef.From = mailMessage.From.ToString();

            ListDictionary replacements = new ListDictionary();

            replacements.Add("<%FIRSTNAME%>", FirstName);
            replacements.Add("<%USERNAME%>", "asd");
            replacements.Add("<%VERIFICATIONLINK%>", VerificationLink);     
            replacements.Add("<%WEBSITE%>", "http://www.mysite.com");

            MailMessage msgHtml = mailDef.CreateMailMessage(To, replacements, new System.Web.UI.Control());
            AlternateView htmlView = AlternateView.CreateAlternateViewFromString(msgHtml.Body, null, "text/html");

            AddLinkedResources(templatePath, ref htmlView);

            mailMessage.AlternateViews.Add(htmlView);

            SmtpClient smtpClient = new SmtpClient();
            Object userState = mailMessage;
            smtpClient.Credentials = new System.Net.NetworkCredential("[e-mail]", "1234567");
            smtpClient.EnableSsl = true;
            smtpClient.Host = "smtp.gmail.com";
            smtpClient.Port = 587;

            //Attach event handler for async callback
            smtpClient.SendCompleted += new SendCompletedEventHandler(smtpClient_SendCompleted);
            try
            {               

                smtpClient.Send(mailMessage);
                EmailStatus = true;
            }
            catch (SmtpException smtpEx)
            {
                EmailStatus = false;

            }
            catch (Exception ex)
            {
                //HttpContext.Current.Response.Write(ex.InnerException);
                EmailStatus = false;

            }

in the web.config i have

<system.net>
    <mailSettings>
      <smtp deliveryMethod="Network" from="[e-mail]">
        <network host="smtp.gmail.com" port="587"
                                       userName="[e-mail]"
                                       password="asd" />
      </smtp>
    </mailSettings>
  </system.net>

Answer 1

Try setting:

smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new System.Net.NetworkCredential("[e-mail]", "1234567");

Also you seem to be subscribing to the SendCompleted event but this event is intended to be used when sending an email asynchronously (SendAsync method), so you could get rid of it. The Send method that you are using is blocking.

You may also checkout the following answer.