What are signatures and what does it mean if the signature is valid or invalid?

Every secure email is signed by the sender of the message to ensure authenticity of the sender and data integrity of the message.

A symbol indicates that the signature associated with this email is valid and the message can be trusted.

A symbol means that the signature associated with this message is not valid and the message may have been forged. We recommend that you either contact the sender of the message or your local technical support personnel.