Sympa is a rich open source mailing list software

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Sympa is a rich open source mailing list software. Its design highly focuses on customization possibilities and ease of administration.

   Advanced features  




Bulk emailer
Internationalization, translated to 15 different languages
Service messages and web pages defined by templates
Subscriber information stored in a RDBMS (Mysql, Pg, Oracle or Sybase)
Web interface with user and admin features
Different web authentication backends including Single Sign-on systems
Web document repository for list members
S/MIME support for both signature verification and mail encryption
Automatic bounces management
External antiviral plugin
Virtual robots management
SOAP ML service
...


http://www.sympa.org/doc.html