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Re: Threads on this mailing list

From: Urs Thuermann <urs_at_isnogud.escape.de>
Date: 2006-06-11 21:20:18 CEST

Kenneth Porter <shiva@sewingwitch.com> writes:

> Threading in mailing lists is implemented using the Message-ID header
> and References header. The References header refers to the Message-ID
> headers of prior messages.

This is almost but not quite true. IIRC, the References header comes
from usenet while Email traditionally used In-reply-to only. Today,
many MUAs generate and use both, but there are still some mailers in
use (I see ELM still quite often) which only know about In-reply-to.

> The Subject line is only used (by some clients) as a workaround to
> systems that break the References chain.

1. Unfortunately, very many posts on this list are generated by broken
   mailers (Outlook seems to be the one most often seen), which
   neither generate the References header nor the In-reply-to header.
   Here the subject line would be of help to do the threading.
   However, together with the subject line mangling of the mailing
   list server this causes threads in this mailing list to be totally

2. Even if correct References and In-reply-to headers were generated
   by all mail user agents here, the subject line mangling is
   annoying. Many mailers don't repeat the subject line in a summary
   overview, if it's identical to the previous line or differs only in
   that it has an "Re: " prepended. In the summary of this svn
   mailing list, I don't get this feature, since the list server's
   subject line mangling causes subject lines of postings in the same
   thread to be different.

On the other hand, I see no good reason for the mailing list server to
insert a space after the colon of "Subject:" header. So I kindly ask
if this could be removed, making this list more pleasant to read.


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Received on Sun Jun 11 21:26:37 2006

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