[Bug 60310] New: Inconsistent 'From ' escaping

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=60310

            Bug ID: 60310
           Summary: Inconsistent 'From ' escaping
           Product: Apache httpd-2
           Version: 2.4.20
          Hardware: PC
                OS: Mac OS X 10.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_mbox
          Assignee: bugs@httpd.apache.org
          Reporter: sebb@apache.org

Body text lines starting with 'From ' need to be escaped in mbox files
otherwise they may be mistaken for the message separator.

On display, the lines need to be unescaped.

The simplest way to do this is to convert 'From ' to '>From ' on output, and
reverse the process when reading the file.

However this does not preserve text lines starting with '>From '.
So a variant of this is to add another '`>' to lines starting with one or more
'>' followed by 'From '.

mod_mbox only adds a single '>' to 'From ' lines.
It does not unescape on display.

So the display of such messages is always wrong, as is the raw message.

The contents of the mbox file is wrong for messages containing '>From '

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