Some sites need the ability to broadcast an announcement to all of their users.
django-announcements was created precisely for this reason. How you present the
announcement is up to you as the site-developer. When working with announcements
that are presented on the website one feature is that they are only viewed once.
A session variable will hold which announcements an user has viewed and exclude
that from their display. announcements supports two different types of filtering
of announcements:
site-wide (this can be presented to anonymous users)
non site-wide (these can be used a strictly a mailing if so desired)
members only (announcements are filtered based on the value of request.user)

Author:
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Brian Rosner