On Apr 9, 2007, at 5:33 AM, Robert Elz wrote:

Uniqueness is what is needed - the hostname issue is that I know of know
way to ensure uniqueness without some kind of global registry

The best uniqueness property for a message is the message itself. Derive the message-id from a cryptographic hash of the message. E.g.:

  Message-ID: md5(message)@sha1(message)

is pretty much guaranteed to be unique for any period of time where the Message-ID matters.

--lyndon


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