Recommended open source java mailing list software [closed]

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Can anyone recommend a based open source mailing list software ?

The following would all be desired if possible:

• Java as the underlying language, as we have people who are experienced with Java
• Something which is packaged as a war and can be dropped into a Tomcat server
• A sleek interface
• Underlying data should be reasonably transparent
• Good support for groups - sometimes we want to send mail to everyone, sometimes only people working in a certain area etc.

This is for a non-profit tax-payer funded research organization, so open-source (free) is a high priority. Thanks.

Answer 1

http://subetha.tigris.org/

Answer 2

Apache James http://james.apache.org/server/2.3.2/mailing_lists.html