Eric Allman wrote:
DKIM Summit on Monday
In another WG the Chair was quite upset when somebody so much
as proposed an "informal" meeting. Here it's apparently okay
to have unannounced (?) DKIM summits.
| (e.g., a mailing list manager might add unsubscribe
| information).
Better say "(e.g. some mailing list managers inappropriately
add unsubscribe info to the body, in addition to or lieu of
the header field for this purpose)".
The DKIM l= is merely a kludge for an utter dubious practice.
use a length that covers the entire presented message except
for the trailing "--CRLF" characters; this is known as the
"N-4" approach.
<http://tools.ietf.org/html/2046#page-22>
| multipart-body := [preamble CRLF]
| dash-boundary transport-padding CRLF
| body-part *encapsulation
| close-delimiter transport-padding
| [CRLF epilogue]
That "4" is a minimum, there could be some junk between "--"
and the final CRLF.
The best l= tricks would fail if the original Content-Type is
not any multipart, e.g. a simple text/html or message/rfc822,
and a weird "list manager" transforms it into multipart/mixed.
Bye, Frank
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