Describe PostFix here.
There is a document here on building and installing a Postfix RPM on Fedora and setting up a CAcert certificate: http://wiki.slugbug.org.uk/Postfix_TLS
Describe PostFix here.
There is a document here on building and installing a Postfix RPM on Fedora and setting up a CAcert certificate: http://wiki.slugbug.org.uk/Postfix_TLS