We have imported Ca certificates in trusted and personal certificate in personal store which is used for signing certificate But when received smime for verification with encryption + sign enable getting below error : '''This message includes digital signature but the signature is invalid. The certificate used to sign the message was issued by a certificate authority that you do not trust for issuing this type of certificate. ''' 2: when encryption is enabled: no error Certificate used for both encryption and digital signature is same only Anyone please help why enabling digital signature is leads to failure