关于php：Laravel 5.1发送电子邮件错误：stream_set_blocking()期望参数1为资源，给定null

Laravel 5.1 sending email error : stream_set_blocking() expects parameter 1 to be resource, null given

我正在使用Laravel 5.1，我想发送电子邮件(smtp)
这是我的.env配置：

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MAIL_DRIVER=smtp
MAIL_HOST=mail.mydomain.ir
MAIL_PORT=587
MAIL_USERNAME=account@mydomain.ir
MAIL_PASSWORD= ....
MAIL_ENCRYPTION=null

这在config/mail.php中：

1	'from' => ['address' =>env('MAIL_USERNAME', '[email protected]'), 'name' => 'ESET'],

和一个测试功能，用于发送简单的测试电子邮件：

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public function getEm()
{
$input = [] ;
Mail::send('emails.simple', $input, function($message) {
$message->to('[email protected]', 'Learning')->subject('Contact view Our Contact Form');
});
return 'Your message has been sent';
}

当我在localhost(在WampServer中)测试此项目时，我运行良好并发送电子邮件ok！

但是，当我想在服务器(在线)中使用它时，我将更改.env配置，因为我的主机支持这样说：

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MAIL_DRIVER=smtp
MAIL_HOST=localhost
MAIL_PORT=587
MAIL_USERNAME=account@mydomain.ir
MAIL_PASSWORD=....
MAIL_ENCRYPTION=null

我看到这个错误：

ErrorException in StreamBuffer.php line 275:

stream_set_blocking() expects parameter 1 to be resource, null given

in StreamBuffer.php line 275 at HandleExceptions->handleError('2',
'stream_set_blocking() expects parameter 1 to be resource, null
given',
'/home2/net45987/domains/esetn32.ir/public_html/la/user/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php',
'275', array('host' => 'localhost', 'timeout' => '30', 'options' =>
array(), 'streamContext' => resource, 'errno' => null, 'errstr' =>
null)) at stream_set_blocking(null, '1') in StreamBuffer.php line 275
at Swift_Transport_StreamBuffer->_establishSocketConnection() in
StreamBuffer.php line 62 at
Swift_Transport_StreamBuffer->initialize(array('protocol' => null,
'host' => 'localhost', 'port' => '587', 'timeout' => '30', 'blocking'
=> '1', 'tls' => false, 'type' => '1', 'stream_context_options' => array())) in AbstractSmtpTransport.php line 113 at
Swift_Transport_AbstractSmtpTransport->start() in Mailer.php line 79
at Swift_Mailer->send(object(Swift_Message), array()) in Mailer.php
line 395 at Mailer->sendSwiftMessage(object(Swift_Message)) in
Mailer.php line 181 at Mailer->send('emails.simple', array(),
object(Closure)) in Facade.php line 222 at
Facade::__callStatic('send', array('emails.simple', array(),
object(Closure))) in CallbackController.php line 114 at
Mail::send('emails.simple', array(), object(Closure)) in
CallbackController.php line 114 at CallbackController->getEm()