Under Mac OS X Mavericks personal certificates in Mail
A certificate must be integrated with the Mavericks in the keychain. Follow the instructions:
- Set up you first need a certificate for your e-mail address that you want to use signed and encrypted e-mails. For this purpose, you need to contact the relevant certification body contact.
- After you have downloaded the certificate to your Mac, double-click on the file. As a result, the certificate is pushed into the key management.
- It is important at this point that the file must have the appropriate extension for the certificates, for example ".p7c" or ".CE". Otherwise, the certificate is copied into the key management.
- Now enter in the Spotlight search at the top right of "keychain access" and select the first hit.
- Below, left-click on the "My certificates" (see image).
- In the list should now appear on your certificate. Click on it and select "trust" > "When using this certificate" Option to "Always trust".
- The certificate is now available for the Sending of encrypted and signed e-mails available.

Certificates under Mavericks
In a further practical tip, you will learn how to use the display format for time and date in OS X Mavericks change.