Expiration of the certificate for signed email

Question

I have a question: I want to get from a signed email (Italian PEC), the expiration of the certificate use to sign or the expiration of the sign.

Is it possible with your library?

I wish you happy new year.

Thanks and kind regards.

Answer 1

You can use IMail.GetSignedCms() to get SignedCms instance and then use its Certificates property.

foreach (var certificate in signedCms.Certificates)
{
    Console.WriteLine("IssuerName.Name " + certificate.IssuerName.Name);
    Console.WriteLine("SubjectName.Name " + certificate.SubjectName.Name);
    Console.WriteLine(certificate.GetExpirationDateString());
}