Yeh, this is a sop to old style Unix mailboxes that got codified into the
mail standard, basically.

Ancient history, if anyone cares:
The message delimiter was /^From /, so internal ones had to be escaped
somehow. Prefixing "> " was how ancient /bin/mail did it, so that ended up
in the standard to avoid disturbing such systems. It didn't change until
Solaris 2 finally added a size to the header (in a rather annoying fashion).
Many mail processing tools, including some mailing list archive software,
still assume this and will break if they're not escaped.

On Tue, Jul 21, 2026 at 10:14 AM Tom Ellis via ghc-devs <
[email protected]> wrote:

> On Tue, Jul 21, 2026 at 04:36:34PM +0300, Wolfgang Jeltsch via ghc-devs
> wrote:
> > I’ve seen it several times that text in mails on this list was prefixed
> > with a `>` although it was not a quotation, which can be very confusing.
>
> See RFC 4155 (https://www.rfc-editor.org/rfc/rfc4155.html), top of
> page 3.
>
> Tom
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-- 
brandon s allbery kf8nh
[email protected]
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