esmtpmail esm = new esmtpmail;
esm.ishtml = false;//不用html格式
//加入对方地址
esm.addrecipient("aaa@bbb.com")
//最多收件人
esm.mailrecipientnum = 1;
//邮件标题
esm.mailsubject = "你好";
//邮件内容
esm.mailbody = "测试";
//邮件服务器,假设为163
esm.maildomain = "smtp.163.com";
//认证用户名
esm.mailserverusername = "username";
//密码
esm.mailserverpassword = "password";
//发送地址
esm.mailfrom = "aaa@163.com";
//发送人姓名
esm.mailfromname = "代码测试";
//是否需要smtp验证，163需要
esm.mailsmtpvalidate = true;

//开始发送
if (esm.send())
{
    //显示成功信息
}
else
{
    //显示错误信息
    //esm.errormessage为错误信息
    //esm.logs 为日志
    //esm.htmllogs为html格式的日志
  }