client authentication

I'm running Messaging Server 4.1. I want to require the http client to present a certificate that matches a trusted CA. I do not want to validate that certificate to an ldap database. I want to further authenticate by username/password. Is there a way to require that a certificate be presented? I know this is doable with a regular http server. I just can't find how to configure it within Messaging Server.

[417 byte] By [belinda] at [2007-11-14]