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1. Open the message that has been digitally signed.
2. Look at the Signed By status line to check the e-mail address of the person that signed the message. It is not enough to check the e-mail address in the From line because you want to make sure who actually signed the message, not just who sent the message.

   

   Important  If the e-mail address on the From line does not match the e-mail address on the Signed By line, the Signed by line is the one you should go by to determine who actually sent the message.

   

3. Check to see if the signature is valid or invalid.
   • If the button on the Signed By status line appears like this , the signature is valid. Click the button for more information about the signature status.
   • If a red line underlines the Signed By status line and the button appears like this , the signature is invalid. Click the button for more information about the signature status.

Notes

• There can be several reasons why the digital signature is not valid. For example, the sender's certificate (certificate: A digital means of proving your identity. When you send a digitally signed message you are sending your certificate and public key. Certificates are issued by a certification authority, and like a driver's license, can expire or be revoked.) may have expired, it may have been revoked by the certificate authority (CA) (certificate authority (CA): An entity, similar to a notary public, that issues digital certificates, keeps track of who is assigned to a certificate, signs certificates to verify their validity, and tracks which certificates are revoked or expired.), or the server that verifies the certificate is unavailable. Contact the sender and notify them of the problem.
• If a delegate (delegate: Someone granted permission to open another person's folders, create items, and respond to requests for that person. The person granting delegate permission determines the folders the delegate can access and the changes the delegate can make.) sent the message on behalf of another person, the delegate's name appears as the sender.