Certificate Signed Date-Time Incorrect

Hi,

I use SMTPClient to send a message and a certificate for Signing is attached to the message. The email is successfully sent with the certificate attached but the 'Signed at' Date on the security properties shows signed date as 01:00:00 01/01/1601.The Certificate Details look ok when I 'View Details'. Please advise.

Regards

Sathyapriya