无法使用Laravel发送邮件

在创建一个GSuite帐户之后，我正在尝试使用Laravel发送邮件，并且它将无法运行 . 它只是说它不会给我一个错误

StreamBuffer.php第269行中的Swift_TransportException：无法与主机smtp.gmail.com [＃0] Build 连接

不知道发生了什么，我已经尝试将我的邮件驱动程序更改为SMTP，sendmail，邮件

尝试将我的连接类型更改为TLS和SSL，同时还将我的端口从587更改为465

这是我发送电子邮件的Controller文件的代码

public function addStudent($Classroom) {
$emails = Request::all();
foreach($emails as $key) {
  if(!Auth::user()->where('email', $key)->first()) {
    $user = new User();
    $user->email = $key;
    $user->name = "New User";
    $token = hash_hmac('sha256', str_random(40), config('app.key'));
    $user->password = $token;
    $user->save();

    $contactfirstname = $user->name;
    $contactemail = $user->email;


    DB::table('password_resets')->insert(['email' => $user->email, 'token' => $token, 'created_at' =>  \Carbon\Carbon::now()->toDateTimeString()]);

    Mail::send('emails.welcomemail', ['user' => $user, 'token' => $token], function ($message) use ($contactfirstname, $contactemail) {
        $message->from('support@truthfultesting.com', 'Truthful Testing Admins');
        $message->to($contactemail, $contactfirstname)->subject('Welcome!');
    });
  } else {
    $user = Auth::user()->where('email', $key)->first();
  }

  $CA = new ClassroomAssociation();
  $CA->studentid = $user->id;
  $CA->classroomid = $Classroom->id;
  $CA->save();
 }
}

和我的.env文件

MAIL_DRIVER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=myemail@mine.com
MAIL_PASSWORD=password
MAIL_ENCRYPTION=tls

最后我的mail.php

<?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", "mail", "sendmail", "mailgun", "mandrill",
|            "ses", "sparkpost", "log"
|
*/

'driver' => env('MAIL_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' => env('MAIL_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' => env('MAIL_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' => 'myemail@myemail.com',
    'name' => 'Name',
],

/*
|--------------------------------------------------------------------------
| 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' => env('MAIL_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' => env('myemail@mine.com'),

/*
|--------------------------------------------------------------------------
| SMTP Server Password
|--------------------------------------------------------------------------
|
| Here you may set the password required by your SMTP server to send out
| messages from your application. This will be given to the server on
| connection so that the application will be able to send messages.
|
*/

'password' => env('password'),

/*
|--------------------------------------------------------------------------
| 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',

];

我读过谷歌上的每一篇文章，以及其他资源，没有什么工作 . 我已启用访问我帐户的安全性较低的应用，以及我目前正在使用应用密码

谢谢！ - 扎克