mailer certificate retrieval via LDAP?

[Steven M. Bellovin]

Are there any common mailers -- open source preferred but not mandatory --
that can query LDAP directories to retrieve X.509 certificates for use in
S/MIME messages?  Evolution and Thunderbird are both able to send S/MIME,
but don't seem to have any easy certificate retrieval mechanisms.

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb

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