Laravel Mailjet email not sending - laravel

Question

I have access to an X-CASH web script, but its email functions are not working. I have tried using SMTP, PHPMail, and Mailjet, but it's not sending emails. And also, I have tried going through the code, but I can't seem to pinpoint the error. I can attach whatever snippet of code or file you need to help me with the issue.
config/mail.php
return [
/*
|--------------------------------------------------------------------------
| Default Mailer
|--------------------------------------------------------------------------
|
| This option controls the default mailer that is used to send any email
| messages sent by your application. Alternative mailers may be setup
| and used as needed; however, this mailer will be used by default.
|
*/
'default' => env('MAIL_MAILER', 'smtp'),
/*
|--------------------------------------------------------------------------
| Mailer Configurations
|--------------------------------------------------------------------------
|
| Here you may configure all of the mailers used by your application plus
| their respective settings. Several examples have been configured for
| you and you are free to add your own as your application requires.
|
| Laravel supports a variety of mail "transport" drivers to be used while
| sending an e-mail. You will specify which one you are using for your
| mailers below. You are free to add additional mailers as required.
|
| Supported: "smtp", "sendmail", "mailgun", "ses",
| "postmark", "log", "array"
|
*/
'mailers' => [
'smtp' => [
'transport' => 'smtp',
'host' => env('MAIL_HOST', 'smtp.mailgun.org'),
'port' => env('MAIL_PORT', 587),
'encryption' => env('MAIL_ENCRYPTION', 'tls'),
'username' => env('MAIL_USERNAME'),
'password' => env('MAIL_PASSWORD'),
'timeout' => null,
'auth_mode' => null,
],
'ses' => [
'transport' => 'ses',
],
'mailgun' => [
'transport' => 'mailgun',
],
'postmark' => [
'transport' => 'postmark',
],
'sendmail' => [
'transport' => 'sendmail',
'path' => '/usr/sbin/sendmail -bs',
],
'log' => [
'transport' => 'log',
'channel' => env('MAIL_LOG_CHANNEL'),
],
'array' => [
'transport' => 'array',
],
],
/*
|--------------------------------------------------------------------------
| 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'),
],
/*
|--------------------------------------------------------------------------
| 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'),
],
],
];