Laravel 默认邮件不起作用

我尝试在注册时发送用户激活电子邮件。我有一个简单的laravel网站，可以注册和身份验证。注册后，没有错误，并且数据已正确存储，但是电子邮件从未实际发送过。尝试了几个不同的例子，但我有同样的问题。

这是我的邮件.php配置文件 -

<?php

return array(

    /*
    |--------------------------------------------------------------------------
    | 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"
    |
    */

    '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 Postmark mail service, which will provide reliable delivery.
    |
    */

    'host' => 'smtp.mailgun.org',

    /*
    |--------------------------------------------------------------------------
    | SMTP Host Port
    |--------------------------------------------------------------------------
    |
    | This is the SMTP port used by your application to delivery e-mails to
    | users of your application. Like the host we have set this value to
    | stay compatible with the Postmark 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' => array('address' => 'admin@klinkon.com', 'name' => 'God'),

    /*
    |--------------------------------------------------------------------------
    | 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' => null,

    /*
    |--------------------------------------------------------------------------
    | 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' => null,

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

    /*
    |--------------------------------------------------------------------------
    | Mail "Pretend"
    |--------------------------------------------------------------------------
    |
    | When this option is enabled, e-mail will not actually be sent over the
    | web and will instead be written to your application's logs files so
    | you may inspect the message. This is great for local development.
    |
    */

    'pretend' => false,

);

这是处理邮件程序的逻辑 - （这是在用户控制器中）

public function postCreate()
    {
            $validator = Validator::make(Input::all(), User::$rules);

        if ($validator->passes()) 
        {
            $act_code = str_random(60);
            $user = new User;
            $user->user_username = Input::get('user_username');
            $user->user_email = Input::get('user_email');
            $user->user_password = Hash::make(Input::get('user_password'));
            $user->user_status = "N";
            $user->user_activation_key = $act_code;
            if($user->save())
            {

              $email_data = array(
             'recipient' => $user->user_email,
             'subject' => 'Activation Email'
              );
                $view_data = array(
                'actkey' => $act_code,
            );

              Mail::send('emails.welcome', $view_data, function($message) use ($email_data) {
                  $message->to( $email_data['recipient'] )
                          ->subject( $email_data['subject'] );
              });


            return Redirect::to('login')->with('message', 'Thanks for registering!');
            }
        } 
        else 
        {
            return Redirect::to('register')->with('message', 'The following errors occurred')->withErrors($validator)->withInput();
        }
    }