Makes a mbox from all the files in the directory -- for example, used for recovering files in Mail.app's .OfflineCache.

make-mbox.py

import mailbox
import email.utils
import os

mbox = mailbox.mbox('recovered.mbox')
mbox.lock()
try:
    for infile in os.listdir(os.path.dirname(os.path.abspath(__file__))):
        if not '.' in infile:
            print "processing: %s" % infile
            fp = open(infile)
            msg = email.message_from_file(fp)
            fp.close() 
            mbox.add(msg)
    mbox.flush()
finally:
    mbox.unlock()