Message is Unsigned

Hi,

If I sign and encypt an email with an SSL certificate when sending an email in Aspose I am able to retrieve and decrypt the message with Aspose as well.

However when I send a message from Outlook (the Windows app, not Office 365) and I sign the message and encrypt it with a SSL certificate and I receive it using my same Aspose application it fails to download the message as it says the "Message is Unsigned".  However the IsSigned propery on the message is set to True.

I am using the same SSL Certificate in both Outlook and Aspose and the padlock icon is visible in the Outlook message showing that it is signed.

Any ideas?

Thanks