Maybe you could send a personal email to the person/persons that aren't doing this correctly?  I just checked the headers in one of my responses, and I think I'm okay.

On 11/12/2013 08:33 AM, Frank Lanitz wrote:
Hi folks,

Sorry for that Geany-OT posting... but please be so kind and take some
second to check whether your mail client is respecting the threading
when answering a post. I've got a lot of spitted up threads here and
it's really annoying and time consuming to put them together again.

In details: When answering a post, your mail client (or at latest yout
mail server) should add a message ID to your mail. This can be checked
in source of your mail and looks similar to:
Message-ID: <527B726C.9070200@frank.uvena.de>
(it's another post of myself)
Also when hitting answer, your client should add the References and
In-Reply-To header to new mail. Also pelase don't answer to the
collection of mails.

Cheers,
Frank



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