Striata Reader - digital signature: invalid

Issue
I get this message when trying to open the attachment - it is something about 'digital signature: invalid'

Explanation
A digital signature is used to prove to the recipient (that's you) of the data / message, that the file (or message) came from the person who sent it and that the content of the file / message was not altered since it was originally sent.

Some mail servers may open arriving messages to run spam filters on the messages. Also, Firewalls may check the content of messages and run security checks against the incoming message. This scanning of the messages often triggers the Digital Signature verification, indicating that the message content may have been altered. If you click the Details button, then the Edit Trust button, and finally the General tab, you will be able to see who is using the signature.



Solution
How to fix this? Click View message to continue and read the content. (Clicking "View message" may be required every time this type of message arrives.) You can also escalate this issue to your support department for help in fixing it.