Re: ReRe: mutt mbox format for new mailboxes: mutt mbox format for new mailboxes

On Fri, May 16, 2025 at 02:46:07PM -0400, Mark E. Mallett wrote:

>One case in point: the bit about only quoting "From_" lines
>if preceded by a blank line. That's one heuristic (if I dare to use the
>word) that was pretty randomly followed in the past. It mostly is now,
>but has not always been.

Those are two different variants of mbox, and they're incompatible. 
Software that expects every "From " line in the message to be escaped, 
will misread a file where some of those lines are not escaped.

Of course, most existing software does a lot of heuristics to try to 
read all variants of mbox, so can probably read both of those.

(Original mbox, from 1974, escaped every message "From " line; the 
Berkeley variant created few years later did the after-blank-line thing.)