John Levine wrote in
 <[email protected]>:
 |It appears that Alessandro Vesely  <[email protected]> said:
 ...
 |>>   We should not go down this path.
 |
 |>Yes, this is a point of disagreement.
 ...
 |>This is where the "annoying" algorithm comes in.  When parsing the To:/Cc:
 |>fields, you can ...
 |
 |No.  That is yet more extra complication with no benefit whatsoever.

Most DKIM software i know already parse From: in order to select
keys and more.  (The one i know which does not, an OpenSMTPD
filter, can have only one configuration at a time, if i recall
correctly.)
This needs the same fully-fledged RFC 5322 parser that is needed
for To: and Cc:, and if only to properly fail for "more than one
address in From:".
(But yes, email address parsing is a hairy thing, if to be done
really right.  With fingers pointing everywhere.)

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)

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