OPTION 1 - Enable Microsoft Office Outlook 2007 to digitally sign all e-mails by default
- In Outlook, click on Tools > Trust Center > E-mail Security
- Select: Add digital signature to outgoing messages
- Next to Default Setting, select the correct certificates (signing and encryption, this may be the same certificate or two separate related certificates) for the default profile.
- Click on OK.
The sign and encrypt icons will now show up in new emails and they will be signed by default.
OPTION 2 - Enable Microsoft Office Outlook 2007 to digitally sign a specific e-mail with a specific certificate
- Launch a new e-mail.
- Click on the Options tab.
- Click on the arrow to the right of More Options.
- Click on Security Settings...
- Click on Add digital signature to this message
- Click on Change Settings
- Next to Signing Certificate, click on Choose and select the new Symantec certificate.
- Next to Encryption Certificate, click on Choose and select the new Symantec certificate.
- Click on OK and OK again.
- Click on Close.
- See solution SO12046 for instructions on configuring Outlook 2000 and 2003 to use a certificate by default.
- See solution SO10780 for instructions on exporting a certificate from Outlook 2000, 2003 and 2007.