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[Andy Armstrong]

On 4 Jul 2011, at 11:27, Joel Bernstein wrote:
> In case anybody is reading this and is still mystified, never ever
> ever begin a new mailing list thread by replying to an old one and
> deleting bits of it, your mail client is likely to set headers like
> References: and In-Reply-To: which will cause your mail to be threaded
> with the old one. Which is exactly what you told your client and the
> list to do, but almost certainly not what you *wanted* to do.

http://www.jwz.org/doc/threading.html

-- 
Andy Armstrong, Hexten