test smtp connection before set up

src/Domain/Settings/Controllers/StoreEmailCredentialsController.php

@@ -1,9 +1,13 @@
 <?php
 namespace Domain\Settings\Controllers;
 
+use Mail;
 use Artisan;
 use Illuminate\Http\Response;
+use Domain\Settings\Mail\TestMail;
+use Symfony\Component\Mailer\Exception\LogicException;
 use Domain\Settings\Requests\StoreEmailCredentialsRequest;
+use Symfony\Component\Mailer\Exception\TransportException;
 
 class StoreEmailCredentialsController
 {
@@ -16,6 +20,39 @@ class StoreEmailCredentialsController
         abort_if(is_demo(), 204, 'Done.');
 
         if (! app()->runningUnitTests()) {
+            // Test smtp server
+            if ($request->input('mailDriver') === 'smtp') {
+                try {
+                    // Get credentials
+                    $credentials = [
+                        'smtp' => [
+                            'driver'       => 'smtp',
+                            'host'         => $request->input('smtp.host'),
+                            'port'         => $request->input('smtp.port'),
+                            'username'     => $request->input('smtp.username'),
+                            'password'     => $request->input('smtp.password'),
+                            'encryption'   => $request->input('smtp.encryption') ?? '',
+                            'from.address' => $request->input('smtp.email') ?? $request->input('smtp.username'),
+                            'from.name'    => $request->input('smtp.email') ?? $request->input('smtp.username'),
+                        ],
+                    ];
+
+                    // Set temporary mail connection
+                    config(['mail' => $credentials['smtp']]);
+
+                    $sender = $request->input('smtp.email') ?? $request->input('smtp.username');
+
+                    // Send test email
+                    Mail::to('test@hi5ve.digital')->send(new TestMail($sender));
+                } catch (TransportException|LogicException $error) {
+                    return response([
+                        'type'    => 'mailer-connection-error',
+                        'title'   => 'Mail Connection Error',
+                        'message' => $error->getMessage(),
+                    ], 401);
+                }
+            }
+
             $mail = [
                 'log'      => [
                     'MAIL_DRIVER' => 'log',

src/Domain/Settings/Mail/TestMail.php

@@ -0,0 +1,29 @@
+<?php
+namespace Domain\Settings\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class TestMail extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    /**
+     * Create a new message instance.
+     */
+    public function __construct(
+        public string $emailFrom
+    ) {
+    }
+
+    /**
+     * Build the message.
+     */
+    public function build(): static
+    {
+        return $this->from($this->emailFrom, 'Test')
+            ->subject('Test Mail')
+            ->view('mails.test-mail');
+    }
+}

src/Domain/SetupWizard/Controllers/StoreEnvironmentSettingsController.php

@@ -1,13 +1,17 @@
 <?php
 namespace Domain\SetupWizard\Controllers;
 
+use Mail;
 use Artisan;
 use Illuminate\Http\Response;
 use Aws\S3\Exception\S3Exception;
+use Domain\Settings\Mail\TestMail;
 use App\Http\Controllers\Controller;
 use League\Flysystem\UnableToWriteFile;
 use Domain\Settings\DTO\S3CredentialsData;
 use Domain\Settings\Actions\TestS3ConnectionAction;
+use Symfony\Component\Mailer\Exception\LogicException;
+use Symfony\Component\Mailer\Exception\TransportException;
 use Domain\SetupWizard\Requests\StoreEnvironmentSetupRequest;
 
 class StoreEnvironmentSettingsController extends Controller
@@ -38,6 +42,39 @@ class StoreEnvironmentSettingsController extends Controller
                 }
             }
 
+            // Test smtp server
+            if ($request->input('mailDriver') === 'smtp') {
+                try {
+                    // Get credentials
+                    $credentials = [
+                        'smtp' => [
+                            'driver'       => 'smtp',
+                            'host'         => $request->input('smtp.host'),
+                            'port'         => $request->input('smtp.port'),
+                            'username'     => $request->input('smtp.username'),
+                            'password'     => $request->input('smtp.password'),
+                            'encryption'   => $request->input('smtp.encryption') ?? '',
+                            'from.address' => $request->input('smtp.email') ?? $request->input('smtp.username'),
+                            'from.name'    => $request->input('smtp.email') ?? $request->input('smtp.username'),
+                        ],
+                    ];
+
+                    // Set temporary mail connection
+                    config(['mail' => $credentials['smtp']]);
+
+                    $sender = $request->input('smtp.email') ?? $request->input('smtp.username');
+
+                    // Send test email
+                    Mail::to('test@hi5ve.digital')->send(new TestMail($sender));
+                } catch (TransportException|LogicException $error) {
+                    return response([
+                        'type'    => 'mailer-connection-error',
+                        'title'   => 'Mail Connection Error',
+                        'message' => $error->getMessage(),
+                    ], 401);
+                }
+            }
+
             $setup = [
                 'broadcasting' => [
                     'pusher' => [