I created the new snakeoil certificates. But it is still giving the following, when apache is restarted. The snakeoil's certificates are specified by default in the file: /etc/apache2/sites-available/default-ssl.2013.04.17.13.39.46
And the iRedMail_CA.pem and iRedMail.key are specified in /etc/apache2/sites-available/default-ssl.
[Tue Jun 04 09:43:50 2013] [notice] caught SIGTERM, shutting down
[Tue Jun 04 09:43:51 2013] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue Jun 04 09:43:52 2013] [notice] ModSecurity for Apache/2.5.12 (http://www.modsecurity.org/) configured.
[Tue Jun 04 09:43:52 2013] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue Jun 04 09:43:53 2013] [notice] Apache/2.2.16 (Debian) mod_ssl/2.2.16 OpenSSL/0.9.8o mod_wsgi/3.3 Python/2.6.6 configured -- resuming normal operations