阿里云服务器发送Email邮件：Expected response code 220 but got code , with message

在阿里云Ecs上发送邮件功能，代码本地测试都ok，在生产环境报错

Connection could not be established with host

这是由于阿里的ecs服务器禁用了25端口,切换成465/994,就可以了。

后面产生了另外一个报错

Expected response code 220 but got code "", with message ""

正确的配置

'mailer' => [
        'class' => 'yii\swiftmailer\Mailer',
        'useFileTransport' =>false,
        'viewPath' => '@common/mail',
        'transport' => [
            'class' => 'Swift_SmtpTransport',
            'host' => '',
            'username' => '',
            'password' => '',
            'port' => '465/994',
            'encryption' => 'ssl',
        ],
        'messageConfig'=>[
            'charset'=>'UTF-8',
            'from'=>['notice@bdelay.com'=>'Bdelay']
        ],

    ],