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 provide commercial
    support, custom patches and customisation for SquirrelMail as well as
    RisuMail.
    
    http://www.risumail.jp/
    
    Enquiries can be made via the RisuMail site above or to
    Scott A. Hughes <sahughes@sanguine.net>.