On Tue, 14 Sep 2010 02:18:41 +0100, John R. Levine <johnl(_at_)iecc(_dot_)com>
wrote:
The final version said
if a message arrives without a valid Author Domain Signature due to
modification in transit, submission via a path without access to a
signing key, or any other reason, the domain encourages the
recipient(s)
to discard it.
Indeed. If an unsigned/invalid message arrives at the MLM, he should
discard it. But the case we are considering is where a perfectly validly
signed message arrives at the MLM, and then the presumption is that the
sender (or the owners of his domain) intend that it should be delivered.
I think it's a reasonable interpretation to say that if you expect your
list software might break the signature, you're doing the sender a favor
by pre-discarding it since that's what the recipients should do anyway.
No, it appears that the MLM has two choices in this situation:
1. Reject of bounce it, with a message of the form "Sorry! We were unable
to forward this message to our list for reason XXXX".
2. Use his best endeavours to ensure that it gets delivered.
And one of the tools in his "best endeavours" armoury is to change the
From: line.
--
Charles H. Lindsey ---------At Home, doing my own thing------------------------
Tel: +44 161 436 6131
Web: http://www.cs.man.ac.uk/~chl
Email: chl(_at_)clerew(_dot_)man(_dot_)ac(_dot_)uk Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K.
PGP: 2C15F1A9 Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5
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