Php 试图使用Swift_Mailer，但在Laravel中出错

我正在使用laravel发送邮件，我第一次尝试着用邮件外观来包装我的脑袋。所以我想我做对了，但我得到了一个

Swift_TransportException in AbstractSmtpTransport.php line 383: Expected response code 220 but got code "503", with message "503 TLS not available
"   

我的控制器的邮件外观是

        Mail::to($sponsor->user_email)->send(new Send_Sponsor($provider,$sponsor));

我转到邮件配置并将值tls的加密删除为nothing，但仍然得到了相同的结果。 我也把邮件从gmail改成了yahoo，但我还是犯了同样的错误。能帮我一些忙吗

下面是我的gmail smtp配置文件

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Mail Driver
    |--------------------------------------------------------------------------
    |
    | Laravel supports both SMTP and PHP's "mail" function as drivers for the
    | sending of e-mail. You may specify which one you're using throughout
    | your application here. By default, Laravel is setup for SMTP mail.
    |
    | Supported: "smtp", "sendmail", "mailgun", "mandrill", "ses",
    |            "sparkpost", "log", "array"
    |
    */

    'driver' =>  'smtp',

    /*
    |--------------------------------------------------------------------------
    | SMTP Host Address
    |--------------------------------------------------------------------------
    |
    | Here you may provide the host address of the SMTP server used by your
    | applications. A default option is provided that is compatible with
    | the Mailgun mail service which will provide reliable deliveries.
    |
    */

    'host' =>  'smtp.gmail.com',

    /*
    |--------------------------------------------------------------------------
    | SMTP Host Port
    |--------------------------------------------------------------------------
    |
    | This is the SMTP port used by your application to deliver e-mails to
    | users of the application. Like the host we have set this value to
    | stay compatible with the Mailgun e-mail application by default.
    |
    */

    'port' => 587,

    /*
    |--------------------------------------------------------------------------
    | Global "From" Address
    |--------------------------------------------------------------------------
    |
    | You may wish for all e-mails sent by your application to be sent from
    | the same address. Here, you may specify a name and address that is
    | used globally for all e-mails that are sent by your application.
    |
    */

    'from' => [
        'address' => 'admin@no-reply.com', 
        'name' => 'application'
    ],

    /*
    |--------------------------------------------------------------------------
    | E-Mail Encryption Protocol
    |--------------------------------------------------------------------------
    |
    | Here you may specify the encryption protocol that should be used when
    | the application send e-mail messages. A sensible default using the
    | transport layer security protocol should provide great security.
    |
    */

    'encryption' =>  'tls',

    /*
    |--------------------------------------------------------------------------
    | SMTP Server Username
    |--------------------------------------------------------------------------
    |
    | If your SMTP server requires a username for authentication, you should
    | set it here. This will get used to authenticate with your server on
    | connection. You may also set the "password" value below this one.
    |
    */

    'username' => 'myusername@gmail.com',

    'password' => 'mypassword',

    /*
    |--------------------------------------------------------------------------
    | Sendmail System Path
    |--------------------------------------------------------------------------
    |
    | When using the "sendmail" driver to send e-mails, we will need to know
    | the path to where Sendmail lives on this server. A default path has
    | been provided here, which will work well on most of your systems.
    |
    */

    'sendmail' => '/usr/sbin/sendmail -bs',

    /*
    |--------------------------------------------------------------------------
    | Markdown Mail Settings
    |--------------------------------------------------------------------------
    |
    | If you are using Markdown based email rendering, you may configure your
    | theme and component paths here, allowing you to customize the design
    | of the emails. Or, you may simply stick with the Laravel defaults!
    |
    */

    'markdown' => [
        'theme' => 'default',

        'paths' => [
            resource_path('views/vendor/mail'),
        ],
    ],

];

---

您是否有Gmail SMTP的应用程序密码？在google my帐户上使用SMTP帐户之前，您应该先创建一个带有双因素验证的新密码。
我也遇到了同样的问题。显然，我使用的IP地址已被列入黑名单。尝试使用具有不同IP地址的不同internet连接。为我工作
如何更正此错误？这和我的配置文件有关吗