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I was asked to supply a list of "open issues" that it would be useful to
discuss at the Vienna meeting

Removal of null recipes for headers

     ie: you always have to document what you changed

     this considerably simplifies DSN handling, and it seems fanciful
     that systems in the middle of the network are altering headers at
     all, let alone in ways they are do not wish recipients to be able
     to undo

Should we explicitly forbid Message-Instance headers that only differ by
ordinal value

     The spec has some MUST NOT's here but all they do is heat up the
     planet, they don't actually cause interworking issues

PQ Algorithm

     The chairs are going to ask for advice and we have had a discussion
     on how that question should be phrased. Stephen Farrell suggested
     just insisting that all signatures MUST pass (but long ago the WG
     disliked that so we have a SHOULD at present)

Case issues in JSON

     should we insist that header field names in the recipe JSON always
     be in lower (or indeed UPPER) case ?

DSN flagging

     Should we provide an explicit way of labelling DSNs (prescribing a
     Subject header field, or adding a flag?) rather than having MTAs
     work it out from the context (and what email address is being sent
     to).

Feedback

     the specification has a framework for asking for feedback but stays
     away from saying what that means. Does the WG think there are
     things to standardise here ?

- -- 
richard @ highwayman . com                       "Nothing seems the same
                          Still you never see the change from day to day
                                And no-one notices the customs slip away"

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