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 Mailman FeaturesHere's a brief description of the new features in Mailman 2.1
The NEWS file contains a detailed summary of all new features.
Here is a short summary of other features in Mailman.  For details,
please see the on-line documentation.Through-the-web list creation and removal (with automatic
    support depending on the MTA)
Multi-lingual support: list web pages and email notices can be in
    any of nearly two dozen supported language, configurable
    per-site, per-list, and per-user
 "Real name" support for members
Much better password-less operation for simple user tasks.
Support for personalized deliveries and
    VERP-like message
    delivery for foolproof bounce detection
Emergency moderation
MIME-based content filtering, with demime/stripmime like options
Regular expression based topic filtering
Better membership management, including searching
Re-organized administrative requests pages
Moderated newsgroup support
A new architecture for the mail delivery subsystem, removing
    the dependence on cron, for better responsiveness and
    scalability
New moderation and privacy controls
Invitations
Autoresponse governors
Users can now change some of their delivery options globally,
    for all lists at a site, including their password, delivery
    status, real name, etc.
Much better MIME and I18n support in the archiver
A separate "list moderator" role has been added
Urgent: header support (bypasses digests to reach all users
    immediately).
 
Web based list administration for nearly all tasks, including list
    configuration, moderation (post approvals), management of user
    accounts.
Web based subscribing and unsubscribing, and user configuration
    management.  Users can temporarily disable their accounts, select
    digest modes, hide their email addresses from other members, etc.
A customizable home page for each mailing list.
Per-list privacy features, such as closed-subscriptions, private
    archives, private membership rosters, and sender-based posting
    rules.
Configurable (per-list and per-user) delivery mode
    Regular (immediate) delivery
        MIME digest
        Plain (RFC
        1153) digests
    
Integrated bounce detection within an extensible framework.
    Automatic disposition of bouncing addresses (disable,
    unsubscribe).
Integrated spam filters
Built-in web-based archiving, with hooks for external archivers such as
    MHonArc.
Integrated Usenet gatewaying.
Integrated auto-replies.
Majordomo-style email based commands.
Multiple list owners and moderators are possible.
Support for virtual domains.
Runs on GNU/Linux and most Un*x-like systems, compatible with most
    web servers and browsers, and most SMTP servers.  Requires Python
    2.1.3 or newer.
An extensible mail delivery pipeline.
High-performance mail delivery, with a scalable architecture.
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