Does signing a mail tell me something about the origin that the IP layer
doesn't already tell me much more cheaply?

Granted, not every subscriber runs their own mail server, but enough do
that it's trivial to verify that a given mail with a given hash sum came
from the list servers.

I'm personally not all that impressed with any of the sender
verification schemes - so far they all seem to be set up to allow bulk
senders to pretend they're not just spammers with nicer suits.

Cheers,
-- 
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|   ,''`.                                            Stephen Gran |
|  : :' :                                        [EMAIL PROTECTED] |
|  `. `'                        Debian user, admin, and developer |
|    `-                                     http://www.debian.org |
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