I'm not able to send mail via mailgun using Laravel - php

Question

I'm facing an issue to send email. I have my website built with Laravel. I have the files set up properly. That happens in 2 files.
The first one contains "driver" which of course is mailgun, "host" (smtp.mailgun.org), "port" (587 and according to my provider it's opened), "encryption" (tls), "username" and "password" (both with the right values).
The second one contains "domain" and "secret" (also both with the right values).
The domain is not the mailgun domain but my own domain, which is ACTIVE after set the Domain Verification and DNS.
The mailgun domain is still there ACTIVE. I don't know if I have to remove it or something. I really don't know what I'm missing here.
IMPORTANT UPDATE
Class 'GuzzleHttp\Client' not found
I'm receiving that message
mail.php
return array(
'driver' => 'mailgun',
'host' => 'smtp.mailgun.org',
'port' => 587,
'from' => array('address' => 'not-reply#xxxxxxxxx.com', 'name' => 'xxxxxxx'),
'encryption' => 'tls',
'username' => "xxxxxxxxxxxxxx",
'password' => "xxxxxxxxxxxxxx",
'sendmail' => '/usr/sbin/sendmail -bs',
'pretend' => false,
);
Obviously, the xxxxxxxxxx are my personal data. I can assure I'm setting the right values. It should work, indeed. :(
services.php
return array(
'mailgun' => array(
'domain' => 'domain-here',
'secret' => 'key-here',
),
'mandrill' => array(
'secret' => '',
),
'stripe' => array(
'model' => 'User',
'secret' => '',
),
);
domain and secret are populated with the right values too.

Answer 1

The #manix suggestion it seems to be the right approach but the version suggested 3.9 is deprecated. So it should be:
"guzzlehttp/guzzle": "~4.0"
As I have the project built with Laravel 4.2.
It should be 5.0 for Laravel 5.0.

Answer 2

Try to require guzzle dependency directly.
Add "guzzle/guzzle": "~3.9#dev" to composer.json like, example:
"require": {
"laravel/framework": "5.0.*",
"guzzle/guzzle": "~4.0"
},
Update your project. The command below shoul be executed in a terminal/console. For example, if your laravel application is hosted in a windows machine, you do:
> cd project/folder/path // change the working path
> composer update // this command update the proyect and dependencies
If you laravel is hosteed in a linux machine the you do:
$ cd /path/a/mi/folder // change the working path
$ composer update // this command update the proyect and dependencies
Test again your application