To configure the S/MIME-plugin, please edit the following file:
This file contain multiple configuration options.
This option allows you to enable or disable the plugin by default for a user.
This option specifies which path’s the OpenSSL library should check for CA Certificates, usually this is /etc/ssl/certs.
Using /etc/ssl/certs (or your default, central distribution SSL certifices) path is recommended.
This option defines which cipher OpenSSL uses to encrypt an S/MIME message, for PHP < 5.4 the greatest cipher option is 3DES, PHP >= 5.4 has added AES ciphers with a key length of up to 256 bit.
A list of supported ciphers are available at php.net: http://php.net/manual/en/openssl.ciphers.php
For security reasons, Using the strongest cipher available is recommended.
This option either enables or disables the OCSP validation of public certificates. OCSP is an Internet protocol used for obtaining the revocation status of an digital certificate.
With this option enabled the browser will offer to save passphrases used in s/mime signing functionality. This functionality is disabled by default.