Mail Not Sending via Mailgun API Laravel 8

I am trying to send mail via the mailgun API from my controller but the mail is not reaching mailgun and I am not getting any error messages/logs.

This is in my .env:

MAIL_MAILER=mailgun
MAILGUN_DOMAIN=subdomain.domain.ca
MAILGUN_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxx

This is in my services.php:

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Third Party Services
    |--------------------------------------------------------------------------
    |
    | This file is for storing the credentials for third-party services such
    | as Mailgun, Postmark, AWS, and more. This file provides the de facto
    | location for this type of information, allowing packages to have
    | a conventional file to locate the various service credentials.
    |
    */

    'mailgun' => [
        'domain' => env('subdomain.domain.ca'),
        'secret' => env('xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'),
    ],

    'postmark' => [
        'token' => env('POSTMARK_TOKEN'),
    ],

    'ses' => [
        'key' => env('AWS_ACCESS_KEY_ID'),
        'secret' => env('AWS_SECRET_ACCESS_KEY'),
        'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),
    ],

];

This is in my mail.php:

<?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', 'mailgun'),

    /*
    |--------------------------------------------------------------------------
    | 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', '[e-mail]'),
        'name' => env('MAIL_FROM_NAME', 'From name'),
    ],

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

];

This is how I am sending the mail in my controller:

Mail::send('emailtemplates.trackeremail', $data, function($message)use($data, $pdf) {
                $message->to($data["toaddress"])
                        ->cc($data["ccaddress"])
                        ->subject($data["title"])
                        ->attachData($pdf->output(), "PDFName.pdf");
            });

This is working when I send to mailgun via SMTP in my local environment but I am unfortunately limited to shared hosting that does not allow 3rd party SMTP and I need to switch to the API method for production. I have gone through many tutorials and questions on this site (and others) related but nothing has solved my issue.

I always run php artisan config:clear after any kind of .env change.

Is there anything else that I can be doing to even get an error message or further debug this? Any help would be appreciated.

Answer

After going over this with A2 Hosting’s technical support it turns out that this is just not possible with their shared hosting, I was informed that “Mailgun only supports the standard SMTP ports, so it is not supported on our shared server”.