Is There Java Source Code For Something Similar To Yahoo E-mail?

The web site project I am working on will provide a feature that is similar to the Yahoo e-mail, i.e.

1. all the received e-mails will be stored in the "individual inbox" for viewing and the user can 'reply' to those messages.

2. users can 'compose' and 'send' e-mails.

I do not want to reinvent the wheel. Please advise if "Java" source codes are available for it.

[396 byte] By [jiapei_jena] at [2007-9-29 5:30:12]