Aspose.Network for .NET v18.104.22.168 has released.
In this major release, we supported S/MIME protocol features. Now you can add a digital signature to your email message.
Here is the sample code:
// load the certificate and associated private key from a file
X509Certificate2 certificate = X509Certificate2.LoadPfx(“mycer.pfx”, “password”);
// create an instance of MailMessage
MailMessage message = new MailMessage();
// set its properties to desired values
message.From = “firstname.lastname@example.org“;
message.To = email@example.com;
message.Subject = “This is a signed message”;
message.TextBody = “Hello, world!”;
// attach a digital signature