RisuMail

    RisuMail is a fully-functional commercial open source webmail
    application based on SquirrelMail.
    
    RisuMail is developed and distributed in Japan by the RisuMail
    Team, which is part of S. A. Hughes Consulting, the provider of
    this site.
    
    The RisuMail Team and S. A. Hughes Consulting provides commercial
    support for SquirrelMail, custom patches and customisation.
    
    http://www.risumail.jp/

    Enquiries can be made via the RisuMail site above or to
    Scott A. Hughes <sahughes@sanguine.net>.