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index 80158fea..c05284ac 100644
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index 38135495..6bdcef3c 100644
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+            "license": [
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+                    "role": "lead"
+                }
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+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
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+            "license": [
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+            ],
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+                    "email": "sebastian@phpunit.de"
+                }
+            ],
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+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
+            "authors": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
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+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
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+            },
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+                    "type": "github"
+                }
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+            "version": "4.0.4",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
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+                "shasum": ""
+            },
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+            "type": "library",
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+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.4"
+            },
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T13:17:30+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8"
+            },
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+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:45:17+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "b233b84bc4465aff7b57cf1c4bc75c86d00d6dad"
+            },
+            "dist": {
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/3.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-03-15T09:54:48+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
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+                "shasum": ""
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+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+            },
+            "dist": {
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+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-07-28T10:34:58+00:00"
+        },
+        {
+            "name": "typo3/testing-framework",
+            "version": "6.16.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/TYPO3/testing-framework.git",
+                "reference": "5b5cd686fdbbdb891930e74c8b70c4c06a785976"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/TYPO3/testing-framework/zipball/5b5cd686fdbbdb891930e74c8b70c4c06a785976",
+                "reference": "5b5cd686fdbbdb891930e74c8b70c4c06a785976",
+                "shasum": ""
+            },
+            "require": {
+                "ext-pdo": "*",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "mikey179/vfsstream": "~1.6.11",
+                "php": ">= 7.2",
+                "phpunit/phpunit": "^8.4 || ^9.0",
+                "psr/container": "^1.0",
+                "typo3/cms-backend": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-core": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-extbase": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-fluid": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-frontend": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-install": "10.*.*@dev || 11.*.*@dev",
+                "typo3/cms-recordlist": "10.*.*@dev || 11.*.*@dev",
+                "typo3fluid/fluid": "^2.5|^3"
+            },
+            "conflict": {
+                "doctrine/dbal": "2.13.0 || 2.13.1"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.8.0",
+                "phpstan/phpstan-phpunit": "^1.1.1",
+                "typo3/cms-workspaces": "10.*.*@dev || 11.*.*@dev",
+                "typo3/coding-standards": "^0.5.3"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "TYPO3\\PrivateContainer\\": "Resources/Core/Functional/Extensions/private_container/Classes/",
+                    "TYPO3\\TestingFramework\\": "Classes/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "TYPO3 CMS Core Team",
+                    "homepage": "https://forge.typo3.org/projects/typo3cms-core",
+                    "role": "Developer"
+                },
+                {
+                    "name": "The TYPO3 Community",
+                    "homepage": "https://typo3.org/community/",
+                    "role": "Contributor"
+                }
+            ],
+            "description": "The TYPO3 testing framework provides base classes for unit, functional and acceptance testing.",
+            "homepage": "https://typo3.org/",
+            "keywords": [
+                "testing",
+                "tests",
+                "typo3"
+            ],
+            "support": {
+                "general": "https://typo3.org/support/",
+                "issues": "https://github.com/TYPO3/testing-framework/issues",
+                "source": "https://github.com/TYPO3/testing-framework/tree/6.16.6"
+            },
+            "time": "2022-07-26T17:30:58+00:00"
         }
     ],
     "aliases": [],
diff --git a/public/typo3conf/ext/ep_events/Classes/Controller/AjaxFormController.php b/public/typo3conf/ext/ep_events/Classes/Controller/AjaxFormController.php
index a463d62a..1772838e 100644
--- a/public/typo3conf/ext/ep_events/Classes/Controller/AjaxFormController.php
+++ b/public/typo3conf/ext/ep_events/Classes/Controller/AjaxFormController.php
@@ -30,6 +30,7 @@ namespace EP\EpEvents\Controller;
 use EP\EpEvents\Domain\Model\Inquiry;
 use EP\EpEvents\Service\ConfigurationService;
 use EP\EpEvents\Service\EmailService;
+use EP\EpEvents\Service\SpamProtectService;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
 use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
 
@@ -46,10 +47,20 @@ class AjaxFormController extends ActionController
      */
     protected $configurationService;
 
-    public function __construct(EmailService $emailService, ConfigurationService $configurationService)
-    {
+    /**
+     * @var SpamProtectService
+     */
+    protected $spamProtectService;
+
+    public function __construct
+    (
+        EmailService $emailService,
+        ConfigurationService $configurationService,
+        SpamProtectService $spamProtectService
+    ) {
         $this->emailService = $emailService;
         $this->configurationService = $configurationService;
+        $this->spamProtectService = $spamProtectService;
     }
 
     /**
@@ -59,15 +70,17 @@ class AjaxFormController extends ActionController
      */
     public function processInquiryFormAction(Inquiry $inquiry)
     {
-        $response['status'] = 'ok';
-        $this->emailService->send([
-            'toEmail' => $this->settings['inquiryToEmail'],
-            'toName' => $this->settings['inquiryToName'],
-            'subject' => 'Anfrage E&P Events',
-            'templateName' => 'Inquiry',
-            'variables' => [ 'inquiry' => $inquiry ]
-        ]);
-        return json_encode($response);
+        if (false === $this->spamProtectService->isSpamEmail($inquiry->getEmail())) {
+            $this->emailService->send([
+                'toEmail' => $this->settings['inquiryToEmail'],
+                'toName' => $this->settings['inquiryToName'],
+                'subject' => 'Anfrage E&P Events',
+                'templateName' => 'Inquiry',
+                'variables' => [ 'inquiry' => $inquiry ]
+            ]);
+        }
+
+        return json_encode(['status' => 'ok']);
     }
 
     /**
@@ -77,25 +90,31 @@ class AjaxFormController extends ActionController
      */
     public function processConfiguratorFormAction(Inquiry $inquiry)
     {
-        $response['status'] = 'ok';
-        $this->emailService->send([
-            'toEmail' => $this->settings['inquiryToEmail'],
-            'toName' => $this->settings['inquiryToName'],
-            'subject' => 'Anfrage E&P Events',
-            'templateName' => 'Configurator',
-            'variables' => [
-                'inquiry' => $inquiry,
-                'config' => $this->configurationService->getConfiguratorConfig(),
-            ]
-        ]);
-        return json_encode($response);
+        if (false === $this->spamProtectService->isSpamEmail($inquiry->getEmail())) {
+            $this->emailService->send([
+                'toEmail' => $this->settings['inquiryToEmail'],
+                'toName' => $this->settings['inquiryToName'],
+                'subject' => 'Anfrage E&P Events',
+                'templateName' => 'Configurator',
+                'variables' => [
+                    'inquiry' => $inquiry,
+                    'config' => $this->configurationService->getConfiguratorConfig(),
+                ]
+            ]);
+        }
+
+        return json_encode(['status' => 'ok']);
     }
 
     /**
      * @return string
      */
     protected function errorAction() {
-        $formErrors = [];
+        $response = [
+            'status' => 'validation',
+            'errors' => [],
+        ];
+
         if ($this->arguments->validate()->hasErrors()) {
             foreach ($this->arguments->validate()->getFlattenedErrors() as $key => $errors)
             {
@@ -106,13 +125,10 @@ class AjaxFormController extends ActionController
                     $translationKey = sprintf('tx_epevents.message.%s.%s', $key, $error->getCode());
                     $errorsRaw[] = LocalizationUtility::translate($translationKey, 'ep_events');
                 }
-                $formErrors[$key] = implode(', ', $errorsRaw);
+                $response['errors'][$key] = implode(', ', $errorsRaw);
             }
         }
 
-        $response['status'] = 'validation';
-        $response['errors'] = $formErrors;
-
         return json_encode($response);
     }
 
diff --git a/public/typo3conf/ext/ep_events/Classes/Service/SpamProtectService.php b/public/typo3conf/ext/ep_events/Classes/Service/SpamProtectService.php
new file mode 100644
index 00000000..2b7aa21a
--- /dev/null
+++ b/public/typo3conf/ext/ep_events/Classes/Service/SpamProtectService.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace EP\EpEvents\Service;
+
+use Symfony\Component\HttpClient\HttpClient;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
+use TYPO3\CMS\Core\SingletonInterface;
+
+class SpamProtectService implements SingletonInterface
+{
+    public function isSpamEmail(string $email): bool
+    {
+        $client = HttpClient::create();
+
+        try {
+            $response = $client->request('GET', 'https://api.stopforumspam.org/api', [
+                'query' => [
+                    'emailhash' => md5($email),
+                ]
+            ]);
+            $result = simplexml_load_string($response->getContent());
+            $success = (bool)$result->attributes()['success'];
+
+            if (false === $success) {
+                return false;
+            }
+
+            $appears = (string)$result->appears === 'yes';
+            if (true === $appears) {
+                return true;
+            }
+        } catch (TransportExceptionInterface $e) {
+        }
+
+        return false;
+    }
+}
diff --git a/public/typo3conf/ext/ep_events/Tests/Unit/Service/SpamProtectServiceTest.php b/public/typo3conf/ext/ep_events/Tests/Unit/Service/SpamProtectServiceTest.php
new file mode 100644
index 00000000..1da7aa56
--- /dev/null
+++ b/public/typo3conf/ext/ep_events/Tests/Unit/Service/SpamProtectServiceTest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace EP\EpEvents\Tests\Unit\Service;
+
+use EP\EpEvents\Service\SpamProtectService;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+
+class SpamProtectServiceTest extends UnitTestCase
+{
+    /**
+     * @test
+     * @dataProvider spamEmailDataProvider
+     */
+    public function canConnectToApi(string $email, bool $isSpam)
+    {
+        $service = new SpamProtectService();
+        $result = $service->isSpamEmail($email);
+        $this->assertEquals($isSpam, $result);
+    }
+
+    public function spamEmailDataProvider()
+    {
+        return [
+            'valid' => [
+                'email' => 'info@ep-reisen.de',
+                'isSpam' => false,
+            ],
+            'invalid' => [
+                'email' => 'ericjonesmyemail@gmail.com',
+                'isSpam' => true,
+            ],
+        ];
+    }
+}