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CERTIFICATE FOR OUTLOOK MAC INSTALL

To exchange public keys with another person, simply exchange signed, unencrypted email messages. If you try to send an encrypted message to an email address that you do not yet have a public key for, Outlook will present a warning dialog allowing you to send the message unencrypted.

If you want to change the digital signature and encryption settings for the message, select the Options tab, then use the Encrypt and Sign buttons to toggle these features on and off.

Note that if you set your preferences to sign email by default, you will see a message saying that “This message will be digitally signed.”

Click the OK button to save your preferences.

Since you can only send an encrypted message to a person if you have their public key, it makes more sense to leave this unchecked.

Use the checkbox labeled Encrypt outgoing messages to set your default encryption preferences.

Please read this how-to for more information.

CERTIFICATE FOR OUTLOOK MAC INSTALL

If you are signing with a Business Identity certificate on a YubiKey, you will need to install a separate S/MIME certificate for encryption. For most users, you can use the same certificate you selected for signing. Next, choose a certificate for encryption from the Certificate menu under Encryption.It is recommended to check all three boxes. Choose your default email signing preferences.If so, make sure that the YubiKey is plugged into the computer when sending signed email. Note that if you are using a Business Identity certificate installed on a YubiKey, you can choose that key for signing. Choose the certificate you want to use for signing from the Certificate drop-down menu under Digital Signing.Select the account your certificate covers, then click the Advanced button.Open Outlook and select Tools > Accounts from the menu.To prevent Outlook from displaying this warning message, apply the registry change described in the Resolution section of this article. Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities:Ĭontinue will encrypt and send the message but the listed recipients may not be able to read it. If the email address of the contact or recipient is different from the email address that is specified in the recipient's certificate, you receive the following warning: When you send an encrypted email message to a recipient, Outlook uses the recipient's certificate to secure the message. Type SupressNameChecks, and then press ENTER. Select the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook.Locate the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook\Security. Select the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook.Locate the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook\Security. Select the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook.Locate the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook\Security. Select the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook.Locate the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook\Security. Select the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook.Locate the following registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook\Security. Type SupressNameChecks, and then press Enter. Right-click the Security key, select New, and then select DWORD Value. On the Edit menu, point to New, and then select Key.

Select the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook.If a Security registry key does not exist, create a new key. Locate the registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook\Security. Select Start, select Run, type regedit in the Open box, and then select OK. Microsoft cannot guarantee that these problems can be solved. These problems might require that you reinstall the operating system. Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method.