What is Communications Data?

[Ian G Batten]

On Fri, 08 Nov 2002, Charles Lindsey wrote:
> Note BTW that some protocols (e.g. uucp) do not have a separate envelope
> (or does it?).

Yes, I think it does: as I recall, uucp mail is sent by using uux to
execute rmail on the remote system, and the arguments to rmail are the
remote recipients.  The From_ line is used as an envelope sender, and
that's where it gets a little stickier.

The only protocol I can think of where the recipient addresses are bound
into the same unit of transfer as the message itself is Greybook, where
you build a file like:

----
igb@uk.ac.bham.cs

To: igb@uk.ac.bham.cs
From: chl@uk.ac.man.cs
Subject: The Past

This is a message about the past
----

and then just transmit it with Bluebook to transport address
[DTE].NIFTP.MAIL.  In that case, you can't get recipients without the
main transfer unit.  But is anyone running Greybook today?  Indeed, is
anyone running uucp?

ian