Question

I am attempting to send an email, although an error message returned saying:

The remote certificate is invalid according to the validation procedure

My code is as follows:

   static void sendEmail()
        {
            var fromAddress = new MailAddress("xxxxxxxx@xxxxxxxx", "xxxxxxx");
            var toAddress = new MailAddress("xxxxxxxx@xxxxxxxx", "xxxxxxxx");
            const string fromPassword = "xxxxxxxxxxxx";
            const string subject = "xxxxxxxxxxxxxxxxxxxxx";

            var smtp = new SmtpClient
            {
                Host = "mailserver",
                Port = 587,
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential("username", fromPassword)
            };
            using (var message = new MailMessage(fromAddress, toAddress)
            {
                Subject = subject,
                Body = bodyglobal
            })
            {
                smtp.Send(message);
            }

        }

Answer 1

try setting

 EnableSsl = false;

I had this issue a few weeks ago and this was the fix. If your program doesnt need/use SSL then a smtpexecption will fire with that error message.