HOME PAGE CUSTOMIZATION
Choose File > Security > User Security (Macintosh OS X users: Lotus Notes > Security > User Security), click Mail, click the "Internet-style Mail Options" button, and then click the "Certificate Configuration" button.
When you select a certificate, you can view who the certificate is issued to and the e-mail addresses represented in the certificate in the "Selected item" section below the certificate. The e-mail addresses shown in the "Email addresses represented within this certificate" field can come from the certificate's "Issued to" name (if the "Issued to" name is in long form, it has "EMAIL=" included in the name) or from the alternative name field. Click "Advanced Details" for more information about a selected certificate.
Choosing your default signing certificate
You can choose which Internet certificate you want to act as your default signing certificate, for sending signed mail over the Internet. If you only have one Internet certificate, then your option to change your default signing certificate is grayed out. Otherwise, to change which certificate to sign messages with, select the certificate, and then select "Use this certificate as your default signing certificate."
Note: It's important that your default signing certificate matches the e-mail address in your encryption certificate. If you change your signing certificate, you may need to make some other changes to your configuration.
Location and encryption certificate configuration
For information on updating your location documents with the correct Internet address for your default signing certificate, see Location configuration for signing Internet-style (S/MIME) mail.
For information on your encryption Internet certificate, see Encryption certificate configuration for Internet-style (S/MIME) mail.
Related topics How Notes uses public and private keys for encrypting and signing mail Requesting Internet certificates To retrieve an Internet cross certificate Using dual Internet certificates for encryption and signatures Accessing servers using certificates Advanced certificate details