[script] dis/assembling mbox email

[Skip Montanaro]

    William> Time to time, I need to 
    William>     - extract main header/body from a MIME email, 
    William>     - parse and extract multipart segments, recursively,
    William>     - walk through the email tree, and edit/delete/add stuffs
    William>     - regenerate new MIME email.

    ...

    William> Usage are 
    William>     unmbox.sh dir < email
    William>     mbox.sh dir > email

    ...

You might be interested in the splitndirs.py script which is part of the
Spambayes distribution.  There is no joindirs.py script, but it's perhaps a
five-line script using the mboxutils.getmbox function (also part of
Spambayes).

Skip