I've been using Chilkat for a few years now and it's worked fine. We recently upgraded our servers to Windows Server 2008 and now when I try to send out an encrypted email, I get this report back from the mailman object. Thing is, these same certificates worked fine before the upgrade.
The server is 64 bit but I have to use the 32 bit version of the dll because just having the 64 bit one in the bin folder causes the site to die.
DllDate: Aug 15 2013
Architecture: Little Endian; 32-bit
Language: .NET 4.0
hcCurDate: Thu, 01 May 2014 15:57:58 -0400
Creating encrypted email
Using explicit certificates for encryption.
Using explicitly specified certificates...
Failed to get certificate's serial number
Failed to create IssuerAndSerial ASN.1
Failed to build RecipientInfo ASN.1
Failed to build PKCS7 enveloped.
Failed to encrypt message
Failed to prepare email
Failed to render email object to MIME
May 01 '14 at 16:27