#!/usr/bin/env python
import urllib
                                                                                
subscribers = open('subscribers.txt', 'rt')
                                                                                
listname = 'mylist'
params = urllib.urlencode({'password':'listpassword',
                           'conceal':0,
                           'options-submit':1})
for subscriber in subscribers:
    u = urllib.urlopen("http://www.example.com/mailman/options/%s/%s" %
                       (listname, urllib.quote(subscriber.strip())),
                       params)
    u.close()