On 2026-01-26 14:53:43 +0100, Vincent Lefevre wrote:
> I suspect that at that time, most software did not care about the
> exact format and just considered the first 5 characters. In any case,
> *all* lines starting with "From " in the body were quoted.

I forgot to say that this applied to messages without a Content-Length
header. In my old mbox files, some messages have an unquoted "From "
in the body, but in all these cases, there is a Content-Length header,
so that this is safe.

-- 
Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)

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