How to ignore certificate validation when sending an email using SmtpClient in Dotnet

Issue:

If there is some Issue with Server certificate below error will occur,

“The remote certificate is invalid according to the validation procedure”

Solution:

1)      Use valid server certificates.

2)      Right code to ignore invalid certificate (refer below code lines).

Code lines:

1.      ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;

2.      smtpClient.Send(mailMessage);

Add Callback handler (ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate) before sending email (before smtpClient.Send() method)

ValidateServerCertificate() definition:

private static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)

        {

            if (sslPolicyErrors == SslPolicyErrors.None)

            {

                return true;

            }

            //The server certificate is not valid. Continuing with sending email.;

            return true;

        }