Re: User-Agent: and In-Reply-To:

From: Mark Millard <>
Date: Sun, 26 Mar 2023 17:36:38 UTC
On Mar 26, 2023, at 10:06, Mark Millard <> wrote:

> Graham Perrin <> wrote on
> Date: Sun, 26 Mar 2023 08:59:22 UTC :
>> Not to start a long debate (or rant), I'm curious.
>> Mark, Peter, please: what do you use to send email?
>> A recent discussion is split across twelve threads; screenshot attached.
>> I looked at headers for a handful of the splits. If I'm not mistaken: 
>> neither a *User-Agent*: field, nor an *In-Reply-To*: field.
> My subscription to this list is via:
> Subscribe without receiving mails:
> and I read the list via a web browser, not via an
> E-mail client. (For example, I've not received your
> query via E-mail so far and I read your query in
> a web browser.)
> This ends up meaning that some of my notes to the list
> are from constructing the note from a web page that
> I'm viewing. (Like this note.) Other times I've been
> TO'd or CC'd and have received it in E-mail as well
> and I've happened to reply to that. Thus a mix occurs
> overall.

Looks like my answer covered In-Reply-To but not User-Agent.

It appears that the analogy(s) for User-Agent for my E-mail
client might be one or both of:

Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.400.51.1.1\))
X-Mailer: Apple Mail (2.3731.400.51.1.1)

I'll also note that I've always read the list via the likes of:

So I'd not seen the "by thread" mess.

Mark Millard
marklmi at