Lance wrote:
> I replied to this message, and as I've not seen it here

May be you have accidentally mailed it to me instead of posting in
mailing list .

> An attempt at clarification:
>
> I am reading this group as e-mail in Thunderbird, individual message
> mode, TB 2.0.0.14, Windows XP SP2.
>
> I also get the Firefox support group messages the same way. FF messages
> have Reply-To in the headers. TB messages don't.

Is it 'Reply-To' or 'In-Reply-To' header ?
'Reply-To' headers appears in your message only if you you have
specified any Reply-To address in the settings of account , you are
using to post messages .

'In-Reply-To' header automatically included in headers when you reply to
any message .


> just started happening recently, as I sometimes get group messages directly addressed to me, instead of the group.
May be it just because of some mailing lists settings . You should
contact with mailing list owner about this problem at this address
"support-thunderbird-owner@lists.mozilla.org"