Add Resend mailer support

.env.example

@@ -43,6 +43,10 @@ MAIL_FROM_NAME="Pterodactyl Panel"
 # @see: https://github.com/pterodactyl/panel/pull/3110
 # MAIL_EHLO_DOMAIN=panel.example.com
 
+# Resend API key (required when MAIL_MAILER=resend)
+# Get your API key at https://resend.com/api-keys
+# RESEND_KEY=
+
 ##
 # CAPTCHA Configuration
 # Supported providers: recaptcha, turnstile, none

app/Console/Commands/Environment/EmailSettingsCommand.php

@@ -21,7 +21,8 @@ class EmailSettingsCommand extends Command
                             {--port=}
                             {--endpoint=}
                             {--username=}
-                            {--password=}';
+                            {--password=}
+                            {--resend-key= : API key for Resend mail transport.}';
 
     protected array $variables = [];
 
@@ -48,6 +49,7 @@ public function handle()
                 'mailgun' => 'Mailgun Transactional Email',
                 'mandrill' => 'Mandrill Transactional Email',
                 'postmark' => 'Postmark Transactional Email',
+                'resend' => 'Resend Transactional Email',
             ],
             $this->config->get('mail.default', 'smtp')
         );
@@ -62,6 +64,12 @@ public function handle()
             $this->config->get('mail.from.address')
         );
 
+        if (empty($this->variables['MAIL_FROM_ADDRESS'])) {
+            $this->output->error('A from address is required for sending emails.');
+
+            return 1;
+        }
+
         $this->variables['MAIL_FROM_NAME'] = $this->option('from') ?? $this->ask(
             trans('command/messages.environment.mail.ask_mail_name'),
             $this->config->get('mail.from.name')
@@ -149,4 +157,22 @@ private function setupPostmarkDriverVariables()
             $this->config->get('mail.username')
         );
     }
+
+    /**
+     * Handle variables for resend driver.
+     */
+    private function setupResendDriverVariables()
+    {
+        $this->variables['MAIL_DRIVER'] = 'resend';
+
+        $this->variables['RESEND_KEY'] = $this->option('resend-key') ?? $this->ask(
+            trans('command/messages.environment.mail.ask_resend_key'),
+            $this->config->get('services.resend.key')
+        );
+
+        if (empty($this->variables['RESEND_KEY'])) {
+            $this->output->error('A Resend API key is required when using the Resend mail driver.');
+            $this->output->comment('You can obtain an API key at https://resend.com/api-keys');
+        }
+    }
 }

composer.json

@@ -42,6 +42,7 @@
         "predis/predis": "^3.3.0",
         "prologue/alerts": "^1.3.0",
         "psr/cache": "^3.0.0",
+        "resend/resend-php": "^0.10.0",
         "s1lentium/iptools": "~1.2.0",
         "spatie/laravel-fractal": "^6.3.2",
         "spatie/laravel-query-builder": "^6.3.6",

config/mail.php

@@ -28,7 +28,7 @@
     | mailers below. You are free to add additional mailers as required.
     |
     | Supported: "smtp", "sendmail", "mailgun", "ses", "ses-v2",
-    |            "postmark", "log", "array", "failover"
+    |            "postmark", "resend", "log", "array", "failover"
     |
     */
 
@@ -56,6 +56,10 @@
             'transport' => 'postmark',
         ],
 
+        'resend' => [
+            'transport' => 'resend',
+        ],
+
         'sendmail' => [
             'transport' => 'sendmail',
             'path' => env('MAIL_SENDMAIL_PATH', '/usr/sbin/sendmail -bs -i'),

resources/lang/en/command/messages.php

@@ -57,6 +57,7 @@
             'ask_mailgun_secret' => 'Mailgun Secret',
             'ask_mandrill_secret' => 'Mandrill Secret',
             'ask_postmark_username' => 'Postmark API Key',
+            'ask_resend_key' => 'Resend API Key',
             'ask_driver' => 'Which driver should be used for sending emails?',
             'ask_mail_from' => 'Email address emails should originate from',
             'ask_mail_name' => 'Name that emails should appear from',

resources/views/admin/settings/mail.blade.php

@@ -27,6 +27,9 @@
                             <div class="col-xs-12">
                                 <div class="alert alert-info no-margin-bottom">
                                     This interface is limited to instances using SMTP as the mail driver. Please either use <code>php artisan p:environment:mail</code> command to update your email settings, or set <code>MAIL_DRIVER=smtp</code> in your environment file.
+                                    @if(config('mail.default') === 'resend')
+                                        <br /><br />You are currently using the <strong>Resend</strong> mail driver. To configure it, set <code>RESEND_KEY</code> in your environment file or run <code>php artisan p:environment:mail</code>.
+                                    @endif
                                 </div>
                             </div>
                         </div>

tests/Integration/Commands/Environment/EmailSettingsCommandTest.php

@@ -0,0 +1,119 @@
+<?php
+
+namespace Pterodactyl\Tests\Integration\Commands\Environment;
+
+use Pterodactyl\Tests\Integration\IntegrationTestCase;
+
+class EmailSettingsCommandTest extends IntegrationTestCase
+{
+    /**
+     * Test that the SMTP driver can be selected and configured.
+     */
+    public function test_smtp_driver_selection(): void
+    {
+        $this->artisan('p:environment:mail', [
+            '--driver' => 'smtp',
+            '--host' => 'smtp.test.com',
+            '--port' => '587',
+            '--username' => 'user@test.com',
+            '--password' => 'secret',
+            '--encryption' => 'tls',
+            '--email' => 'panel@test.com',
+            '--from' => 'Test Panel',
+        ])->assertExitCode(0);
+
+        // Verify the .env file was updated
+        $env = file_get_contents(base_path('.env'));
+        $this->assertStringContainsString('MAIL_DRIVER=smtp', $env);
+        $this->assertStringContainsString('MAIL_HOST=smtp.test.com', $env);
+        $this->assertStringContainsString('MAIL_PORT=587', $env);
+        $this->assertStringContainsString('MAIL_FROM_ADDRESS=panel@test.com', $env);
+    }
+
+    /**
+     * Test that the Resend driver can be selected and configured.
+     */
+    public function test_resend_driver_selection(): void
+    {
+        $this->artisan('p:environment:mail', [
+            '--driver' => 'resend',
+            '--resend-key' => 're_test_123456789',
+            '--email' => 'panel@test.com',
+            '--from' => 'Test Panel',
+        ])->assertExitCode(0);
+
+        $env = file_get_contents(base_path('.env'));
+        $this->assertStringContainsString('MAIL_DRIVER=resend', $env);
+        $this->assertStringContainsString('RESEND_KEY=re_test_123456789', $env);
+        $this->assertStringContainsString('MAIL_FROM_ADDRESS=panel@test.com', $env);
+    }
+
+    /**
+     * Test that the Resend driver shows an error when no key is provided.
+     */
+    public function test_resend_driver_warns_without_key(): void
+    {
+        $this->artisan('p:environment:mail', [
+            '--driver' => 'resend',
+            '--resend-key' => '',
+            '--email' => 'panel@test.com',
+            '--from' => 'Test Panel',
+        ])->assertExitCode(0);
+
+        // The command should still write the env (it warns but doesn't abort)
+        $env = file_get_contents(base_path('.env'));
+        $this->assertStringContainsString('MAIL_DRIVER=resend', $env);
+    }
+
+    /**
+     * Test that the mail config includes the resend mailer.
+     */
+    public function test_resend_mailer_is_configured(): void
+    {
+        $mailers = config('mail.mailers');
+
+        $this->assertArrayHasKey('resend', $mailers);
+        $this->assertEquals('resend', $mailers['resend']['transport']);
+    }
+
+    /**
+     * Test that the services config includes the resend key.
+     */
+    public function test_resend_service_config_exists(): void
+    {
+        $this->assertNotNull(config('services.resend'));
+        $this->assertArrayHasKey('key', config('services.resend'));
+    }
+
+    /**
+     * Test that existing SMTP configuration is not affected.
+     */
+    public function test_smtp_config_unchanged(): void
+    {
+        $smtp = config('mail.mailers.smtp');
+
+        $this->assertEquals('smtp', $smtp['transport']);
+        $this->assertArrayHasKey('host', $smtp);
+        $this->assertArrayHasKey('port', $smtp);
+        $this->assertArrayHasKey('encryption', $smtp);
+        $this->assertArrayHasKey('username', $smtp);
+        $this->assertArrayHasKey('password', $smtp);
+    }
+
+    /**
+     * Test that the from address validation works.
+     */
+    public function test_empty_from_address_returns_error(): void
+    {
+        $this->artisan('p:environment:mail', [
+            '--driver' => 'smtp',
+            '--host' => 'smtp.test.com',
+            '--port' => '587',
+            '--username' => 'user@test.com',
+            '--password' => 'secret',
+            '--encryption' => 'tls',
+            '--email' => '',
+            '--from' => 'Test Panel',
+        ])->assertExitCode(1);
+    }
+}