The problem is that different mailers use different systems, so you 
should consider as many as you can.  One last thing you must consider 
is for those mailers (very common!) who do not even include any 
reference to the original, except the subject "Re: origina_subject".

        dZ.

On Aug 30, 2005, at 04:23, Wilfried Mestdagh wrote:

> Hello,
>
> If I want to reply on a mail and I want to have that the receiver of 
> the
> reply has the possibility to display in same thread like many mail
> readers do, do I have to use the 'References' header or 'In-Reply-To'
> header ?
>
> It seems that both are sometime used, eg I see a thread here started
> with this one:
>    Message-ID: <[EMAIL PROTECTED]>
> first reply uses References:
>    Message-ID: <[EMAIL PROTECTED]>
>    References: <[EMAIL PROTECTED]>
> second reply use In-Reply-To:
>    Message-ID: <[EMAIL PROTECTED]>
>    In-Reply-To: <[EMAIL PROTECTED]>
>
> Whitch one is preferred ?  Or do both have a different meaning ?
>
> ---
> Rgds, Wilfried
> http://www.mestdagh.biz
> mailto:[EMAIL PROTECTED]
>
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