Connection could not be established with host mailtrap.io [php_network_getaddresses: getaddrinfo failed: No such host is known. #0]

Question

I am getting below error:

Connection could not be established with host smtp.gmail.com [php_network_getaddresses: getaddrinfo failed: No such host is kno

Answer 1

.env

MAIL_DRIVER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=yourmail@gmail.com
MAIL_PASSWORD=yourmailIDpassword
MAIL_ENCRYPTION=tls

config/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", "sendmail", "mailgun", "mandrill", "ses",
|            "sparkpost", "log", "array"
|
*/

'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.mailgun.org'),

/*
|--------------------------------------------------------------------------
| 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' => env('MAIL_FROM_ADDRESS', 'hello@example.com'),
    'name' => env('MAIL_FROM_NAME', 'Example'),
],

/*
|--------------------------------------------------------------------------
| 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('MAIL_USERNAME'),

'password' => env('MAIL_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',

/*
|--------------------------------------------------------------------------
| 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'),
    ],
],

/*
|--------------------------------------------------------------------------
| Log Channel
|--------------------------------------------------------------------------
|
| If you are using the "log" driver, you may specify the logging channel
| if you prefer to keep mail messages separate from other log entries
| for simpler reading. Otherwise, the default channel will be used.
|
*/

'log_channel' => env('MAIL_LOG_CHANNEL'),

];

app/Http/Controllers/yourcontroller.php

use App\Mail\sendMail;
use Mail;

public function fnmail($name,$password,$userid,$email)
{ 
  $data = array('name'=>$name, 'password' => $password, 'userid' => $userid);
  Mail::send('mail', $data, function($message) use ($name, $email) {
  $message->to($email, $name)
        ->subject('Subject');  //to redirect mail.blade.php page
  $message->from('YourMail@gmail.com','DoNotReply');
  });
}

then create folder under app.. the folder name is Mail under this folder create sendMail.php file

sendMail.php

<?php

namespace App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

class sendMail extends Mailable
{
use Queueable, SerializesModels;

/**
 * Create a new message instance.
 *
 * @return void
 */
public function __construct()
{
    //
}

/**
 * Build the message.
 *
 * @return $this
 */
public function build()
{
    return $this->view('register'); //to redirect register page
}
}

then add resources/views/mail.blade.php

mail.blade.php

<!DOCTYPE html>
<html>
<head>
  <title>Mail Sending</title>
</head>
<body>
  <table align='center' style='height: 200px;width: 200px'>
   <tr><td colspan='2' bgcolor='skyblue' style='text-align: center;font-weight: 
  bold;size: 20px;'><label> Mail Check </label></td></tr>
   <tr bgcolor='#fff7e6'>
   <tr><td style='color: magenta;font-weight: bold;'><label><b>Your UserName:</b> 
 </label></td><td><b>{{$name}}</b></td></tr><br>
   <tr><td style='color: magenta;font-weight: bold;'><label><b>Your LoginID:</b> 
 </label></td><td><b>{{$userid}}</b></td></tr><br>
 <tr><td style='color: magenta;font-weight: bold;'><label><b>Your Password:</b> 
 </label></td><td><b>{{$password}}</b></td><br></tr>
</tr>
<tr><td colspan='2' align='center' bgcolor='orange'><a 
href='http://localhost/larashop/laravelProject/public/login'>
<button>Login</button></a></td></tr></table>
</body>
</html>

Answer 2

This problem occurs when some changes have been made to files, specifically in .env file

Clear cache using artisan command

php artisan cache:clear

Clear config

php artisan config:clear

Restart your server

sudo service apache2 restart

More: Try clearing browsers cache & cookies. Hope that works