On Tue, Jan 29, 2002 at 12:57:21PM +0000, Edmund GRIMLEY EVANS wrote:
> Because in general you don't want to unfold (concatenate) header
> fields.
>
> I don't think Mail::Header should be folding (splitting up) headers at
> all.
>
> RFC 822 merely says you can fold header lines, not that you should. In
> the case of an unstructured field, such as Subject, splitting up and
> concatenating the header may destroy deliberate layout, for example:
>
> Subject: Awake! for Morning in the Bowl of Night
> Has flung the Stone that puts the Stars to Flight
>
> Obviously an MTA may want to unfold the text in order to display it in
> a summary list, but I don't see why Mail::Header has to mess with it.
>
> So, I suggest you try complaining to the maintainer of Mail::Header.
> Perhaps they would be willing to only split up structured header
> lines, for example.
I think you're right. I'm going to write to Graham Barr and
Eryq about this as soon as I find an answer. At the moment, I'm calling:
$subject = encode_mimewords ($subject, Encoding => "B", Charset => "UTF-8");
$message->head->fold_length ("Subject", 4096);
$message->head->add ("Subject", $subject);
This works. It's a bit of a hack. And we're generating over-long
headers, and I have no idea what the effect of that will be on
MTAs ...
Rich.
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