[TASK] Only send test mail when input valid mail

Classes/Controller/MailController.php

@@ -210,6 +210,14 @@ class MailController extends ActionController {
 			);
 		}
 
+		$message = LocalizationUtility::translate('backend.success', 'sg_mail');
+		$this->addFlashMessage($message, '', FlashMessage::OK);
+
+		if (!filter_var($parameters['emailAddress'], FILTER_VALIDATE_EMAIL)) {
+			$arguments = $this->request->getArguments();
+			$this->redirect('index', NULL, NULL, $arguments);
+		}
+
 		$objectManager = GeneralUtility::makeInstance(ObjectManager::class);
 		/** @var \SGalinski\SgMail\Service\MailTemplateService $mailTemplateService */
 		$mailTemplateService = $objectManager->get(MailTemplateService::class);
@@ -231,9 +239,6 @@ class MailController extends ActionController {
 			$this->addFlashMessage($message, '', FlashMessage::ERROR);
 		}
 
-		$message = LocalizationUtility::translate('backend.success', 'sg_mail');
-		$this->addFlashMessage($message, '', FlashMessage::OK);
-
 		$arguments = $this->request->getArguments();
 		$this->redirect('index', NULL, NULL, $arguments);
 	}

Resources/Private/Templates/Mail/Index.html

@@ -79,7 +79,7 @@
 				<f:form method="post" controller="Mail" action="sendTestMail">
 					<div class="col-md-12 form-group">
 						<f:form.submit class="btn-primary btn form-group" value="{f:translate(key:'backend.send_test')}" />
-						<f:form.textfield name="parameters[emailAddress]" type="email" required="TRUE" class="email-input form-group" value="{beUserMail}" />
+						<f:form.textfield name="parameters[emailAddress]" class="email-input form-group" value="{beUserMail}" />
 						<f:form.hidden name="parameters[selectedTemplate]" value="{selectedTemplateKey}" />
 						<f:form.hidden name="parameters[selectedExtensionKey]" value="{selectedTemplate.extension}" />
 						<f:form.hidden name="parameters[selectedExtension]" value="{selectedTemplate.extension}" />