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The SMTP server supports what is referred to as third party authentication. To take advantage of this you would need to provide all of the authentication code, however -- there's no way to do part of the authentication and then pass control back to the messaging server for the rest. So you'd need to do both password checks, one of which is presumably done via LDAP auth, yourself.
As far as LDAP proxy and RADIUS, we use a standard LDAP simple bind. The ODSEE LDAP proxy is often used in OCMS deployments, so that is a known good solution. We don't directly support RADIUS; the aforementioned third party authentication could be used to tie into such a system.