Alvaro Herrera <alvherre@alvh.no-ip.org> writes:

> On 2019-Jun-30, Tomi Ollila wrote:
>
>> Just checking line starting with 'From ' would be pretty naïve since
>> From may be first word in any line in text body.
>
> Even so, early mail systems relied on there not being any such lines,
> and they escaped those lines to be ">From" or to use quoted-printable
> encoding.  GMime has bespoke code to do this, in fact.  Mail systems
> stopped doing this escaping after MIME boundaries got more widely used,
> I suppose.

As far as I know this is still correct for mbox files in general.
In general confusion arises because notmuch has a strict idea of what an
mbox is (file starts with "From "), while other software takes a more
relaxed approach.
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