1.配置

<?php 
return array (
  'email_host' => 'smtp.aliyun.com',
  'email_port' => '25',
  'email_username' => 'diandodo@aliyun.com',
  'email_password' => 'xxxxxx',
  'email_from' => 'diandodo@aliyun.com',
  'email_fromname' => '点多多',
  'email_subject' => '助店宝商户激活邮箱',
  'email_body' => "尊敬的用户{$username}您好:
       您的激活码为<font color='red'>{$code}</font>,请将激活码输入进行验证! 激活码有效期为6分钟^_^",
);

2.发送函数

// 发送邮件
    private function _sendEmail($email,$code,$username = '') {
        import('@.ORG.phpmailer');
        $mail = new PHPMailer(); //建立邮件发送类,类名不一定与引入的文件名相同
        $mail->CharSet = "UTF-8";
        $mail->IsSMTP(); // 使用SMTP方式发送
        $mail->Host = C('email_host'); // 您的企业邮局域名
        $mail->SMTPAuth = true; // 启用SMTP验证功能
        $mail->Username = C('email_username'); // 邮局用户名(请填写完整的email地址)
        $mail->Password = C('email_password'); // 邮局密码
        $mail->Port=C('email_port');
        $mail->From = C('email_from'); //邮件发送者email地址
        $mail->FromName = C('email_fromname');
        $mail->AddAddress("$email", "$username");
        $mail->IsHTML(true); // set email format to HTML //是否使用HTML格式
        $mail->Subject = C('email_subject'); //邮件标题
        $email_body = "尊敬的用户<strong>{$username}</strong>您好:
       您的激活码为<font color='red'>{$code}</font>,请将激活码输入进行验证! 激活码有效期为6分钟^_^";
        $mail->Body = $email_body; //邮件内容，上面设置HTML，则可以是HTML

        if(!$mail->Send())
        {
            return array('status'=>2,'info'=>$mail->ErrorInfo);
        } else {
            return array('status'=>1,'info'=>'发送成功');;
        }
    }

3.生成验证码保存到session中，并发送

// 发送邮箱激活码
    public function sendActivationcode() {
        session($this->activationtime, null); 
        $activationtime = session($this->activationtime);
        $email = $this->_post('email', 'trim');
        if (IS_AJAX && (!$activationtime || time() > $activationtime)) {
            $activationcode = rand(1000, 9999);
            $res = $this->_sendEmail($email,$activationcode,$this->user['username']);
            if($res['status'] == 1) {
                //设置发送限制时间
                session($this->activationtime, time() + 50);
                session($this->activationcode, array('code' => $activationcode, 'time' => time() + 600));
                $this->ajaxReturn(array('result' => true));
            } else {
                //发送失败写入日志文件
                $log = date('Y-m-d H:i:s') . " 发送失败:{$res['info']}" . PHP_EOL;
                file_put_contents(RUNTIME_PATH . 'Log/activationcode.log', $log, FILE_APPEND);
                $this->ajaxReturn(array('result' => false, 'error' => $res['info']));
            }
        } else {
            $this->ajaxReturn(array('result' => false, 'error' => '错误的请求'));
        }
    }

4.验证并绑定

// 绑定邮箱
    public function bind_email() {
        if (IS_POST) {
            // 获取验证码
            $activationcode = $this->_post('activationcode','trim');
            $email = $this->_post('email','trim');
            $session_activationcode = session($this->activationcode);
            if (time() > $session_activationcode['time']  || $activationcode != $session_activationcode['code']) {
                $this->error('验证码有误');
            } else {
                M('User')->where(array('id'=>$this->user['id']))->save(array('email'=>$email));
                $this->success('绑定成功',U('Account/my'));
            }
        } else {
            $this->display();
        }
    }

小结：
1.这是一种思路，跟发送手机验证码差不多。
2.区别在于一个是发送短信，一个是发送邮件。
3.二一个，一个发送主体是阿里大鱼，一个发送主体是公司申请的邮箱。
4.三一个，发送短信收费，发送邮件免费。