про удобства

[Aleksey Korotkov]

On Thu, 24 Jan 2008 15:31:29 +0300
Serge Matveenko wrote:

SM> он показывает _удобно_ для пользователя

Очень удобно. Специально провёл тест: отослал 2 письма на gmail с
одинаковым Subject, но не в ответ одно на другое, а независимые
письма. Через Web-интерфейс Гугль их дебильным образом показывает в
одном треде.

Очень хорошо суть вопроса изложена в листе рассылки mplayer,
http://lists.mplayerhq.hu/pipermail/ffmpeg-user/2007-June/009369.html

	The message subject has nothing to do with threading, although
	some mail readers will automatically place messages with the
	same subject under the same top-level thread.

	Threading, on a per-message level (that is, to determine which
	message is the "parent" of a new message in the cascading
	tree), is done by the In-Reply-To mail header which is set by
	any good mail client.

	There are a sizable number of message headers in every E-mail
	message, providing mostly-technical information which you never
	see if you don't go looking for it. I believe Gmail provides a
	way to view those headers, but I have no idea what it is, since
	I avoid Gmail both for practical (or formerly practical) and for
	philosophical reasons.

	The In-Reply-To header in particular gives the exact (and, by
	and large, unique) numeric ID of the message to which the new
	one is a reply. Threading is performed on the basis of these
	headers. The Subject line is completely ignored (other than
	perhaps as a fallback) except by asocial mail clients, and
	would not be enough to produce proper message-by-message
	threading in any case.

В последней фразе, между прочим, очень удачное определение "умных"
почтовых клиентов (asocial mail clients).

-- 
С уважением,
А.В.Коротков,

mailto:ziga на uni.udm.ru