Digitally Sign Email - Microsoft Outlook 2007

Feb 25, 2025

Digitally Sign Email - Microsoft Outlook 2007

Guidelines:

1. The first step to securing your email messages is to sign them using your digital certificate.
   Open a new message to begin securing your email using your client digital certificate.
   
   

2. In the Message ribbon under the Options section, select between the two mail security icons.
   
   Signing icon = This will sign your email with the certificate of your choice.
   Encrypting icon = This will encrypt your email.
   Note: You will need the public key of your recipient before you can encrypt your email.
   
   
   
   Your digital signature enables the recipient of your message to verify that you actually sent the message. It also guarantees the message was not altered en route. Signing your email will also give your recipient your public key. This will allow your recipient to send you encrypted emails in the future.
3. To ensure that only the recipient can read a message you must be sure to encrypt the message by exchanging public keys with the recipient and clicking the encrypting icon. If the recipient of your signed message uses an S/MIME–enabled email package, they can still read your message. In this case, however, your digital signature will show up as an attachment. The signed icon shows that the received message was signed.

The untrusted signature icon shows that the received message was signed by a certificate which was issued by a CA which you do not trust yet. This is either because you have not installed the CA's root certificate or it has been revoked.