PHPMailer是一个用于发送电子邮件的PHP函数包，非常强大；可以设定发送邮件地址、回复地址、邮件主题、html网页，上传附件,并且使用起来非常方便。直接用PHP就可以发送，无需搭建复杂的Email服务。
它提供的功能包括：
在发送邮时指定多个收件人，抄送地址，暗送地址和回复地址
支持多种邮件编码包括：8bit，base64，binary和quoted-printable
支持SMTP验证
支持冗余SMTP服务器
支持带附件的邮件和Html格式的邮件
自定义邮件头
支持在邮件中嵌入图片
调试灵活
经测试兼容的SMTP服务器包括：Sendmail,qmail,Postfix,Imail,Exchange等
可运行在任何平台之上
内部函数
mail函数
php本身提供了一个邮件发送函数mail，可以在程序中直接发送电子邮件，不过该函数要求服务器支持sendmail或者必须设置一台不需要中继的邮件发送服务器，但要找到一台不需要身份验证的邮件发送中继几乎不可能，所以使用mail函数往往无法成功发送email．
自己如果熟悉SMTP协议，结合socket功能就可以编写高效稳定的邮件发送程序，但对一般用户来说太困难．好在互联网上已经有很多别人编写好的邮件发送模块，我们只需要下载后简单调用即可，十分方便．
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