On Thu, 2 Apr 2009, Piotr Dobrogost wrote:

> I'm wondering if it's possible to answer to specific email sent to some
> mailing list without having this email in the mail client. Taking into
> account threading, of course. In other words - on what base are emails
> threaded on the mailing list?

In general that's not possible but you can always just use the proper (same)
subject (with a Re: prefix probably) and do sensible quoting to repair that
inability somewhat.

References: and In-Reply-To: are two headers used by mail clients to refer to
particular emails this mail is "derived" from.

-- 
  / daniel.haxx.se