C# - Verify digital signature and decrypt email - S/MIME¶

using System;
using System.Text;
using System.IO;
using EAGetMail; //add EAGetMail namespace
using System.Security.Cryptography.X509Certificates;

namespace receiveemail
{
    class Program
    {
        static void ParseEmail(string emlFile)
        {
            Mail oMail = new Mail("TryIt");
            oMail.Load(emlFile, false);

            if (oMail.IsEncrypted)
            {
                try
                {
                    // this email is encrypted, we decrypt it by user default certificate.
                    // you can also use specified certificate like this
                    /* X509Certificate2 decryptCert = new X509Certificate2("D:\\mycert\\test.pfx",
                    "nosecret",
                    X509KeyStorageFlags.Exportable | X509KeyStorageFlags.UserKeySet);
                    oMail.DecryptMessage(decryptCert);
                    */

                    oMail.DecryptMessage(null);
                }
                catch (Exception ep)
                {
                    Console.WriteLine(ep.Message);
                }
            }

            if (oMail.IsSigned)
            {
                try
                {
                    // This email is digital signed.
                    X509Certificate2 signerCert = oMail.VerifyMessageSignature();
                    Console.WriteLine("This email contains a valid digital signature.");

                    // You can add the certificate to your certificate storage like this
                    /*
                    X509Store store = new X509Store("My", StoreLocation.CurrentUser);
                    store.Open(OpenFlags.ReadWrite);
                    store.Add(signerCert);
                    store.Close();
                    */
                    // then you can use send the encrypted email back to this sender.
                }
                catch (Exception ep)
                {
                    Console.WriteLine(ep.Message);
                }
            }

            // Parse Mail From, Sender
            Console.WriteLine("From: {0}", oMail.From.ToString());

            // Parse Mail To, Recipient
            MailAddress[] addrs = oMail.To;
            for (int i = 0; i < addrs.Length; i++)
            {
                Console.WriteLine("To: {0}", addrs[i].ToString());
            }

            // Parse Mail CC
            addrs = oMail.Cc;
            for (int i = 0; i < addrs.Length; i++)
            {
                Console.WriteLine("To: {0}", addrs[i].ToString());
            }

            // Parse Mail Subject
            Console.WriteLine("Subject: {0}", oMail.Subject);

            // Parse Mail Text/Plain body
            Console.WriteLine("TextBody: {0}", oMail.TextBody);

            // Parse Mail Html Body
            Console.WriteLine("HtmlBody: {0}", oMail.HtmlBody);

            // Parse Attachments
            Attachment[] atts = oMail.Attachments;
            for (int i = 0; i < atts.Length; i++)
            {
                Console.WriteLine("Attachment: {0}", atts[i].Name);
            }
        }

        static void Main(string[] args)
        {
            try
            {
                ParseEmail("c:\\my folder\\test.eml");
            }
            catch (Exception ep)
            {
                Console.WriteLine(ep.Message);
            }
        }
    }
}