signed e-mail (openssl)

pokerface

hi,

does anyone know how i can send signed e-mail messages?
I'm using apache/mysql/php/mod_ssl/openssl.
I've successfully created a ca.key, ca.crt, server.csr. and apache and php are configured to run SSL. (bin/apachectl startssl is running).

But how can I send signed e-mail messages?

Thnx in advance,