修改原来单一SMTP,增加SMTP的增加与修改,实现多SMTP选择；

增加单发和群发模式下SMTP的选择，以及可在邮件正文中插入时间变量{time}；

增加了个性群发模式，通过收件人名称{name}、收件人地址{mail}和时间{time}等变量，让每发送的邮件都不同；同时当前SMTP发送失败后自动更换SMTP,大大提高发送效率。

增加用户列表的修改功能，可以让每个已经加进去的邮件地址都可以更改，然后按原有的排列方式返回原来的页面。-Modify the original single SMTP, Increase Increase and modification of SMTP, SMTP multi-choice

By increasing the bulk and single mode SMTP choices, and time variables can be inserted in the message body {time}

Adds personality bulk mode, the recipient s name {name}, recipient address {mail} {time} and time and other variables, so that each message sent is different　while the current SMTP failed after sending automatic replacement SMTP, greatly improving transmission efficiency.

Modify the function to increase the list of users, so that each may have added the e-mail address can be changed, according to the original arrangement then return to the original page.