Question

I am using OpenPOP
I am trying to retrieve mail from an in office exchange server. This is my code

 popClient.Connect(host.Host, (int)host.Port, (bool)host.Ssl);
 popClient.Authenticate(host.Username, host.Password);

Prodlem is the SSL Certificate is created in iis 7 and isnt a valid certificate is there any way for my to bypass this.

It gives me the error remote certificate is invalid according to the validation procedure.

Answer 1

Yes, there is a way. It requires some small code changes is the POPClient class.

Step 1: Replace the constructor for the SslStream instance that is used to authenticate the server with one that allows you to provide a delegate for validating the certificate supplied by the remote party. Therefore replace

SslStream stream = new SslStream(clientSocket.GetStream(), false); 

from POPClient class, Connect method with

SslStream stream = new SslStream(clientSocket.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null);

Step 2: Provide the method that is called by the delegate and force the validation of the remote certificate by returning always true:

public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{         
    return true;  // force the validation of any certificate
}

For further details on this subject, please check the documentation available on msdn.