old_contents: from django.contrib import admin
  from django.conf.urls.defaults import patterns, url
  from django.shortcuts import get_object_or_404
  from django.utils.translation import ugettext as _
  from django.http import HttpResponseRedirect
  from django.core.urlresolvers import reverse
  
  from .models import Newsletter, NewsletterItem, NewsletterSubscriber, NewsletterList
  
  
  class NewsletterItemInline(admin.TabularInline):
      model = NewsletterItem
  
  
  class NewsletterAdmin(admin.ModelAdmin):
      change_form_template = 'admin/courriers/newsletter/change_form.html'
  
      list_display = ('name', 'headline', 'published_at', 'status', 'newsletter_list',)
      list_filter = ('published_at', 'status',)
      inlines = [NewsletterItemInline]
  
      def get_urls(self):
          urls = super(NewsletterAdmin, self).get_urls()
          my_urls = patterns(
              '',
              url(r'^send/(?P<newsletter_id>(\d+))/$',
                  self.send_newsletter,
                  name="send_newsletter")
          )
          return my_urls + urls
  
      def send_newsletter(self, request, newsletter_id):
          from courriers.backends import get_backend
  
          backend_klass = get_backend()
          backend = backend_klass()
  
          newsletter = get_object_or_404(Newsletter, pk=newsletter_id)
          backend.send_mails(newsletter)
  
          self.message_user(request, _('The newsletter "%s" has been sent.') % newsletter)
          return HttpResponseRedirect(reverse('admin:courriers_newsletter_change', args=(newsletter.id,)))
  
  
  class NewsletterItemAdmin(admin.ModelAdmin):
      list_display = ('content_type', 'name', 'description', 'newsletter',)
  
  
  class NewsletterSubscriberAdmin(admin.ModelAdmin):
      list_display = ('email', 'user', 'lang', 'is_unsubscribed',)
      list_filter = ('is_unsubscribed',)
  
  
  class NewsletterListAdmin(admin.ModelAdmin):
      list_display = ('name', 'slug', 'created_at',)
  
  
  admin.site.register(Newsletter, NewsletterAdmin)
  admin.site.register(NewsletterItem, NewsletterItemAdmin)
  admin.site.register(NewsletterSubscriber, NewsletterSubscriberAdmin)
  admin.site.register(NewsletterList, NewsletterListAdmin)
  
new_contents: from django.contrib import admin
  from django.conf.urls import patterns, url
  from django.shortcuts import get_object_or_404
  from django.utils.translation import ugettext as _
  from django.http import HttpResponseRedirect
  from django.core.urlresolvers import reverse
  
  from .models import Newsletter, NewsletterItem, NewsletterSubscriber, NewsletterList
  
  
  class NewsletterItemInline(admin.TabularInline):
      model = NewsletterItem
  
  
  class NewsletterAdmin(admin.ModelAdmin):
      change_form_template = 'admin/courriers/newsletter/change_form.html'
  
      list_display = ('name', 'headline', 'published_at', 'status', 'newsletter_list',)
      list_filter = ('published_at', 'status',)
      inlines = [NewsletterItemInline]
  
      def get_urls(self):
          urls = super(NewsletterAdmin, self).get_urls()
          my_urls = patterns(
              '',
              url(r'^send/(?P<newsletter_id>(\d+))/$',
                  self.send_newsletter,
                  name="send_newsletter")
          )
          return my_urls + urls
  
      def send_newsletter(self, request, newsletter_id):
          from courriers.backends import get_backend
  
          backend_klass = get_backend()
          backend = backend_klass()
  
          newsletter = get_object_or_404(Newsletter, pk=newsletter_id)
          backend.send_mails(newsletter)
  
          self.message_user(request, _('The newsletter "%s" has been sent.') % newsletter)
          return HttpResponseRedirect(reverse('admin:courriers_newsletter_change', args=(newsletter.id,)))
  
  
  class NewsletterItemAdmin(admin.ModelAdmin):
      list_display = ('content_type', 'name', 'description', 'newsletter',)
  
  
  class NewsletterSubscriberAdmin(admin.ModelAdmin):
      list_display = ('email', 'user', 'lang', 'is_unsubscribed',)
      list_filter = ('is_unsubscribed',)
  
  
  class NewsletterListAdmin(admin.ModelAdmin):
      list_display = ('name', 'slug', 'created_at',)
  
  
  admin.site.register(Newsletter, NewsletterAdmin)
  admin.site.register(NewsletterItem, NewsletterItemAdmin)
  admin.site.register(NewsletterSubscriber, NewsletterSubscriberAdmin)
  admin.site.register(NewsletterList, NewsletterListAdmin)
  
subject: Fix for Django 1.6 compat