I think that appending the message-id on a new continuation line
would be good enough. It wouldn't repair incoming References header
lines that are too long, though.
Hrm. I thought about that, but it seems like it's slightly suboptimal;
You'd have to deal with a header that would take up a lot of space.
Also, if you want 'nice' formatting, you need something smarter that knows
about the length of the header (like what formataddr does). Really, I think
you could adapt most of the formataddr code, except for splitting at commas.
It may be that my concerns about "nice" header formatting are not worthwhile.
--Ken
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