When I left they hadn't worked it out, only plaintext artifacts could be extracted. There was discussion of server plugins to intercept and store SSL keys and l

When I left they hadn't worked it out, only plaintext artifacts could be extracted. There was discussion of server plugins to intercept and store SSL keys and later use those to decrypt data, but this would require endpoint access and complex interaction back to the appliance. However, in the case of email, although you might utilize encrypted protocols to send/receive, a direct or indirect recipient might not, so at some point the message may cross the wire in plaintext.