用Java编写的邮件收发系统，具有很强的使用价值，界面美观，使用方便！,Prepared to use Java to send and receive e-mail system, the value of a strong, beautiful interface, easy to use!

A folder tree with support for drag and drop. Rearrange the nodes in the tree by dragging and dropping them like you do with folders in a file manager or in a mail program(Outlook, Thunderbird etc.). Ajax is used to send the new structure to the serv