Subj : SEEN-BY
To : Paul Hayton
From : Andrew Leary
Date : Mon Apr 01 2019 05:26 am
Hello Paul!
01 Apr 19 12:15, you wrote to all:
PH> Mark is saying that Mystic SEEN-BY lines may be incorrect in that at
PH> the start of each line he says there should be a reference to the NET
PH> like this example he gave.
PH> When James is back on deck I was going to feed this info back to him
PH> but wanted to do due diligence first and find FTSC docs that explain
PH> this requirement.
PH> At the moment I can't find anything except in FTS-0004 where there's a
PH> section about SEEN-BY but no mention of the need to start each line
PH> with a NET/NODE combo.
PH> Can someone point me to where I can reference this need and provide
PH> any commentary about this subject please?
http://ftsc.org/docs/fsc-0074.001 has this to say:
3. Seen-by Lines
Seen-by lines are the focus of EchoMail distribution control
information. They are used to determine which addresses
(systems) have received messages. There can be as many seen-
by lines as required to store the necessary information.
Seen-by lines consist of "SEEN-BY:<space>", followed by a list
of net/node numbers corresponding to the systems which have
received that message. The net/node number of each system to
which a message is exported is added to the seen-by lines at
the time of export.
There shall be exactly one set of seen-by lines in a message.
Seen-by lines:
- Shall follow the origin line.
- Shall begin with the nine character literal: _
SEEN-BY:<space>
- Shall contain a list of net/node numbers.
- Shall be no more than 80 characters long including the
required literal.
The complete lines might look like:
SEEN-BY: 104/1 501 132/101 113 136/601 1014/1
SEEN-BY: 1014/2 3
The list of net/node numbers:
- Shall identify at least one address. "Blank" seen-by
lines shall not be transmitted.
- Shall be sorted in ascending net/node order.
- Shall not contain repeated node numbers.
- Shall use only "2D" net/node notation.
- May use short form address notation where a net number is
listed once on any one line. These 2 lines are
equivalent:
SEEN-BY: 104/1 104/501 132/101 132/113 136/601
SEEN-BY: 104/1 501 132/101 113 136/601
Some implementations insert a Ctrl-A (0x01) immediately
preceding the SEEN-BY: literal (^ASEEN-BY:).
Six months after adoption of this document the ^ASEEN-BY:
format shall be processed equally with the SEEN-BY: format
when either occurs in received packets.
_
The critical phrase is: "May use short form address notation where a net
number is listed once on any one line."
My interpretation is that the net number must be listed at least once on any
one SEEN-BY line.
Regards,
Andrew
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