>I think you nailed it: It's an unexamined assumption.  But so, to me
>at least, is the assertion that an author signature to a list is a
>bad idea for senders and will only serve to confuse verifiers.  I'd
>like to see some data collected from such systems before I'm willing
>to agree or disagree with either perspective.  And until then, I
>don't want to exclude anything.

I have to agree that more data could be helpful.  You have mine, where
the retained signature isn't.

>A favourite example of mine: A DKIM signature with an "l=" ...

>Another: A DKIM signature arrived and validated, but failed to cover
>the Subject: header field. ...

The DKIM spec certainly provides ample opportunity for signers to do
silly things.  If we're doing a BCP, it might be useful to suggest
situations where a technically valid DKIM signature probably isn't
useful, with these two examples, l= that doesn't cover the whole
message and unsigned subject, being good examples.

R's,
John
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