Cannot send embeded image with Swift Mailer

I am using Swift Mailer in Laravel 5.1 to send email. In my other projects the same code is working fine. But, in this project it is showing an exception when I try to embed an inline image.

The error:

FatalErrorException in StreamBuffer.php line 163:

Maximum execution time of 30 seconds exceeded

1. in StreamBuffer.php line 163

Code for sending mail:

$transport = \Swift_SmtpTransport::newInstance('smtp.gmail.com',587,'tls')
    ->setUsername('myemail@gmail.com')
    ->setPassword('mypasword');
$mailer = \Swift_Mailer::newInstance($transport);
$message = \Swift_Message::newInstance('my subject');

$client = Client::query()->findOrFail($id);

$data = [
    'login' => $client['contact_email'],
    'password' => $client['password'],
    'image' => $message->embed(\Swift_Image::fromPath(asset('resources/assets/images/mail_logo.jpg'))),
];

$message->setTo([$client['contact_email'] => $client['name']]);
$message->setFrom(['myemail@gmail.com' => 'My Name']);
$message->setBody(view('emails.registrationConfirmation',$data)->render(),'text/html');

$mailer->send($message);

My email file:

<img src="{{ $image }}" alt="Mail Logo" class="text-center"/>
<p>Dear Member,</p>
<br/>
<p>Your account has been verified.</p>
<br/>
<p>Your current login name : <b>{{ $login }}</b></p>
<p>Your login password is : <b>{{ $password }}</b></p>
<br/>
<p>The My Company</p>
<br/>
<p>If this is not yours account or this email sent by mistake, please contact with us. <a href="http://ift.tt/1VfnVqz">Contact us</a></p>

When I comment 'image' => $message->embed(\Swift_Image::fromPath(asset('resources/assets/images/mail_logo.jpg'))), this line the mail is sending of course without the image. When I try to send an embedded image it shows the above exception.

via Chebli Mohamed