用Java编写的基于API的邮件发送端。

发送时需要填写发送人用户名和密码（若没有则任意，但不能为空）。经过测试可以用sina的和Gmail的邮箱，但不支持126、163的邮箱（若支持smtp的则应该可以）。-Prepared to use Java-based API of the e-mail client. Sent when the sender to fill in username and password (if not the arbitrary, but it can not be empty). Tested can be used sina and Gmail e-mail, but do not support the 126,163-mail (if the support of the smtp should be able to).