请阅读文档http://book.cakephp.org/2.0/en/models/data-validation.html#Validation::email
看一下源代码。所有的答案都在那里。

class User extends AppModel {
    public $validate = array(
        'email' => array(
            array(
                'rule' => array('email'),
                'message' => 'Please enter a valid email address',
            ),
        ),
    );
}

在您的模型中，将以下内容

public $validate = array(
             //.... other validation here
        'email'=>array(
            'Valid email'=>array(
                'rule'=>array('email'),
                'message'=>'Please enter a valid email address'
            ),));

当您提交（保存）时，它将自动验证