expire.py

#!/usr/bin/env python

import mailbox
import os
import sys
import time

my_maildir = 'Maildir'

expire_dates = {
    'Logs': 60,
    'Django': 0.1,
    'Cron': 7}

maildir = os.path.join(os.environ['HOME'], my_maildir)
# None causes the mailbox to return Maildir instances
trash = mailbox.Maildir(os.path.join(maildir, 'Trash'), None)
now = time.time()

for box_subdir, max_age in expire_dates.iteritems():
    box = mailbox.Maildir(os.path.join(maildir, box_subdir), None)
    for k, m in box.iteritems():
        if now - m.get_date() > 86400 * max_age:
            if not 'F' in m.get_flags():
                # Move it to the trash
                sys.stdout.write('T')
                trash.add(m)
                box.discard(k)
        else:
            sys.stdout.write('.')