On Thu, Sep 05, 2024 at 02:21:13PM +0200, Thomas Mörbauer via Postfix-users
wrote:
> For example
> Message-ID:
> <a1249d24-4b93-4bff-a523-123456789abc@aaaaaaaaaa-aaaaaaaaaaaa.aaaaa>
> would not be written into the In-Reply-To.
> So a simple crlf with space.
That's rather different than what you appeared to say. Here there's
folding whitespace *before* (not in the middle of) the Message-ID.
This should ideally be accepted as well-formed, but this requires the
code that extracts the message-id to be willing to "unfold" such
headers, which isn't currently the case.
Perhaps a special case could be made for folds immediately after
the header label, because no actual unfolding is required, just
need to remember to treat the next line as the entire header
payload...
There are no clear cut rules on what to do with folding in the
middle of the Message-ID payload, and it has long been obsolete,
so just tolerating whitespace after the header label should
be sufficient.
--
Viktor.
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