Issue with Magebuzz_Testimonial module. Mails are not sending

I use mailcatcher within docker magento under wsl2.

Overall the module works good, but I can’t get any mail on submit.

Code from Result.php in Controller/Index

<?php
/**
 * @copyright Copyright (c) 2016 www.magebuzz.com
 */
namespace MagebuzzTestimonialControllerIndex;

use MagebuzzTestimonialModelTestimonialFactory;
use MagentoFrameworkAppActionAction;
use MagentoFrameworkAppActionContext;
use MagentoFrameworkFilesystem;
use MagentoFrameworkViewResultPageFactory;

class Result extends Action
{

    /**
     * @var MagentoFrameworkAppCacheTypeListInterface
     */
    protected $cacheTypeList;

    protected $resultPageFactory;
    protected $testimonialFactory;
    protected $forwordFactory;
    /**
     * @var MagentoFrameworkImageAdapterFactory
     */
    protected $adapterFactory;
    /**
     * @var MagentoMediaStorageModelFileUploaderFactory
     */
    protected $uploader;
    /**
     * @var MagentoFrameworkFilesystem
     */
    protected $filesystem;
    protected $_helper;


    /**
     * Recipient email config path
     */
    const XML_PATH_EMAIL_RECIPIENT = 'contact/email/recipient_email';
    /**
     * @var MagentoFrameworkMailTemplateTransportBuilder
     */
    protected $_transportBuilder;

    /**
     * @var MagentoFrameworkTranslateInlineStateInterface
     */
    protected $inlineTranslation;

    /**
     * @var MagentoFrameworkAppConfigScopeConfigInterface
     */
    protected $scopeConfig;

    /**
     * @var MagentoStoreModelStoreManagerInterface
     */
    protected $storeManager;
    /**
     * @var MagentoFrameworkEscaper
     */
    protected $_escaper;

    protected $_filesystem;
    protected $_storeManager;
    protected $_directory;
    protected $_imageFactory;

    public function __construct(
        Context $context,
        PageFactory $pageFactory,
        TestimonialFactory $testimonialFactory,
        MagentoFrameworkAppCacheTypeListInterface $cacheTypeList,
        MagentoFrameworkImageAdapterFactory $adapterFactory,
        MagentoMediaStorageModelFileUploaderFactory $uploader,
        MagentoFrameworkFilesystem $filesystem,
        MagebuzzTestimonialHelperData $helper,
        MagentoFrameworkMailTemplateTransportBuilder $transportBuilder,
        MagentoFrameworkTranslateInlineStateInterface $inlineTranslation,
        MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
        MagentoStoreModelStoreManagerInterface $storeManager,
        MagentoFrameworkEscaper $escaper,
        MagentoFrameworkImageAdapterFactory $imageFactory
    )
    {
        $this->_filesystem = $filesystem;
        $this->_storeManager = $storeManager;
        $this->_directory = $filesystem->getDirectoryWrite(MagentoFrameworkAppFilesystemDirectoryList::MEDIA);
        $this->_imageFactory = $imageFactory;

        $this->cacheTypeList = $cacheTypeList;
        $this->_helper = $helper;
        $this->adapterFactory = $adapterFactory;
        $this->uploader = $uploader;
        $this->filesystem = $filesystem;
        $this->testimonialFactory = $testimonialFactory;
        $this->resultPageFactory = $pageFactory;
        parent::__construct($context);
        $this->_transportBuilder = $transportBuilder;
        $this->inlineTranslation = $inlineTranslation;
        $this->scopeConfig = $scopeConfig;
        $this->storeManager = $storeManager;
        $this->_escaper = $escaper;
    }

    public function execute()
    {
        $data = $this->getRequest()->getPostValue();
        /** @var MagentoBackendModelViewResultRedirect $resultRedirect */
        $resultRedirect = $this->resultRedirectFactory->create();
        if ($data) {


            //start block upload image
            if (isset($_FILES['avatar']) && isset($_FILES['avatar']['name']) && strlen($_FILES['avatar']['name'])) {
                /*
                * Save image upload
                */
                try {
                    $base_media_path = 'magebuzz/testimonial/images/';
                    $uploader = $this->uploader->create(
                        ['fileId' => 'avatar']
                    );
                    $uploader->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png']);
                    $imageAdapter = $this->adapterFactory->create();
                    $uploader->addValidateCallback('image', $imageAdapter, 'validateUploadFile');
                    $uploader->setAllowRenameFiles(true);
                    $mediaDirectory = $this->filesystem->getDirectoryRead(MagentoFrameworkAppFilesystemDirectoryList::MEDIA);
                    $result = $uploader->save(
                        $mediaDirectory->getAbsolutePath($base_media_path)
                    );

                    // Resize and keep save new folder //
                    $this->imageResize($_FILES['avatar']['name']);
                    // Resize and keep save new folder //

                    $data['avatar'] = $result['name'];
                } catch (Exception $e) {
                    if ($e->getCode() == 0) {
                        $this->messageManager->addError($e->getMessage());
                    }
                }
            }
            //end block upload image

            /** @var MagebuzzTestimonialModelTestimonial $model */
            $model = $this->_objectManager->create('MagebuzzTestimonialModelTestimonial');

            $id = $this->getRequest()->getParam('mb_testimonial_id');
            if ($id) {
                $model->load($id);
            }

            $model->setData($data);

            // Check approved
            if ($this->_helper->isApprove() == 1) {
                $model->setIsActive(2);
                if($this->_helper->isApproveEmail() ==1){
                    //$model->sendApprovedEmailToCustomer();
                }
            }

            try {
                $model->save();

                // Start send email
                if($this->_helper->isSubmitEmail() ==1){
                    //$model->sendSubmittedEmailToCustomer();
                }
                // End send email

                $this->cacheTypeList->invalidate('full_page');
                $this->messageManager->addSuccess(__($this->_helper->getMessageThankYou()));
                $this->_objectManager->get('MagentoBackendModelSession')->setFormData(false);
                if ($this->getRequest()->getParam('back')) {
                    return $resultRedirect->setPath('*/*/edit', ['mb_testimonial_id' => $model->getId(), '_current' => true]);
                }
                return $resultRedirect->setPath('*/*/');
            } catch (MagentoFrameworkExceptionLocalizedException $e) {
                $this->messageManager->addError($e->getMessage());
            } catch (RuntimeException $e) {
                $this->messageManager->addError($e->getMessage());
            } catch (Exception $e) {
                $this->messageManager->addException($e, __('Something went wrong while saving the Testimonial.'));
            }

            return $resultRedirect->setPath('*/*/index', ['mb_testimonial_id' => $this->getRequest()->getParam('mb_testimonial_id')]);
        }
        return $resultRedirect->setPath('*/*/');
    }

    public function imageResize($data)
    {
        $image = $data;

        $absPath = $this->_filesystem->getDirectoryRead(MagentoFrameworkAppFilesystemDirectoryList::MEDIA)->getAbsolutePath('magebuzz/testimonial/images/') . $image;

        $imageResized = $this->_filesystem->getDirectoryRead(MagentoFrameworkAppFilesystemDirectoryList::MEDIA)->getAbsolutePath('magebuzz/testimonial/images/resized/') . $image;

        $imageResize = $this->_imageFactory->create();

        $imageResize->open($absPath);

        $resizeImage = 400;

        // get origin width image
        $widthOld = $imageResize->getOriginalWidth();

        // get origin height image
        $heightOld = $imageResize->getOriginalHeight();
        $scaleWidth = ($widthOld/$heightOld);
        $scaleHeight = ($heightOld/$widthOld);

        if($widthOld > $heightOld)
        {
            $imageResize->resize(null, $resizeImage);
            $newWidth = round($scaleWidth * $resizeImage);
            $imageResize->crop(0, ($newWidth - $resizeImage) / 2, ($newWidth - $resizeImage) / 2, 0);
        }else{
            $imageResize->resize($resizeImage, null);
            $newHeight = round($scaleHeight * $resizeImage);
            $imageResize->crop(($newHeight - $resizeImage) / 2, 0, 0, ($newHeight - $resizeImage) / 2);
        }
        $dest = $imageResized;

        $imageResize->save($dest);


        $resizedURL = $this->_storeManager->getStore()->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA) . 'magebuzz/testimonial/images/resized/' . $image;

    }
}

Testimonial Model

<?php
/**
 * @copyright Copyright (c) 2016 www.magebuzz.com
 */
namespace MagebuzzTestimonialModel;

use MagentoFrameworkModelAbstractModel;

class Testimonial extends AbstractModel
{
    const XML_PATH_SUBMITTED_EMAIL_TEMPLATE = 'testimonial_config/group_testimonial_email_configuration/config_email_template_posting';
    const XML_PATH_APPROVED_EMAIL_TEMPLATE = 'testimonial_config/group_testimonial_email_configuration/config_email_template_approving';

    const STATUS_APPROVE = 2;
    const STATUS_PENDING = 1;
    const STATUS_DENY    = 0;

    /**
     * Store manager
     *
     * @var MagentoStoreModelStoreManagerInterface
     */
    protected $_storeManager;

    protected $scopeConfig;

    /**
     * @var MagentoFrameworkMailTemplateTransportBuilder
     */
    protected $_transportBuilder;

    /**
     * @var MagentoFrameworkTranslateInlineStateInterface
     */
    protected $inlineTranslation;

    protected $_testimonialHelper;

    /**
     * Testimonial constructor.
     * @param MagentoFrameworkModelContext $context
     * @param MagentoStoreModelStoreManagerInterface $storeManager
     * @param MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig
     * @param MagentoFrameworkRegistry $registry
     * @param MagentoFrameworkMailTemplateTransportBuilder $transportBuilder
     * @param MagentoFrameworkTranslateInlineStateInterface $inlineTranslation
     * @param MagebuzzTestimonialHelperData $testimonialHelper
     * @param MagentoFrameworkModelResourceModelAbstractResource|null $resource
     * @param MagentoFrameworkDataCollectionAbstractDb|null $resourceCollection
     * @param array $data
     */
    function __construct(
        MagentoFrameworkModelContext $context,
        MagentoStoreModelStoreManagerInterface $storeManager,
        MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
        MagentoFrameworkRegistry $registry,
        MagentoFrameworkMailTemplateTransportBuilder $transportBuilder,
        MagentoFrameworkTranslateInlineStateInterface $inlineTranslation,
        MagebuzzTestimonialHelperData $testimonialHelper,
        MagentoFrameworkModelResourceModelAbstractResource $resource = null,
        MagentoFrameworkDataCollectionAbstractDb $resourceCollection = null,
        array $data = [])
    {
        $this->_storeManager = $storeManager;
        $this->scopeConfig = $scopeConfig;
        $this->_transportBuilder = $transportBuilder;
        $this->inlineTranslation = $inlineTranslation;
        $this->_testimonialHelper = $testimonialHelper;
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

    protected function _construct()
    {
        $this->_init('MagebuzzTestimonialModelResourceModelTestimonial');
    }

    public function getAvailableStatuses(){
        return [
            self::STATUS_APPROVE => __('Approve'),
            self::STATUS_PENDING => __('Pending'),
            self::STATUS_DENY    => __('Deny')
        ];
    }

    public function sendSubmittedEmailToCustomer()
    {
        $storeId = $this->_storeManager->getStore()->getId();
        $this->_testimonialHelper->setStoreId($storeId);

        $this->inlineTranslation->suspend();

        try {
            //load store amdmin email
            $sender = [
                'email' => $this->scopeConfig->getValue(
                    'trans_email/ident_support/email',
                    MagentoStoreModelScopeInterface::SCOPE_STORE
                ),
                'name' => $this->scopeConfig->getValue(
                    'trans_email/ident_support/name',
                    MagentoStoreModelScopeInterface::SCOPE_STORE
                )
            ];

            $replyTo = $this->scopeConfig->getValue(
                'trans_email/ident_support/email',
                MagentoStoreModelScopeInterface::SCOPE_STORE
            );

            $transport = $this->_transportBuilder
                ->setTemplateIdentifier($this->scopeConfig->getValue(
                    self::XML_PATH_SUBMITTED_EMAIL_TEMPLATE,
                    MagentoStoreModelScopeInterface::SCOPE_STORE,
                    $storeId))
                ->setTemplateOptions(['area' => MagentoFrameworkAppArea::AREA_FRONTEND, 'store' => $storeId])
                ->setTemplateVars([
                    'testimonial' => $this,
                    'subject' => __('About Your Testimonial')
                ])
                ->setFrom($sender)
                ->addTo($this->getMbTestimonialEmail(), $this->getMbTestimonialName())
                ->setReplyTo($replyTo)
                ->getTransport();

            $transport->sendMessage();
            $this->inlineTranslation->resume();
        }
        catch (Exception $e) {
            //silence is gold
        }
    }

    public function sendApprovedEmailToCustomer()
    {
        $storeId = $this->_storeManager->getStore()->getId();
        $this->_testimonialHelper->setStoreId($storeId);

        $this->inlineTranslation->suspend();

        try {
            //load store amdmin email
            $sender = [
                'email' => $this->scopeConfig->getValue(
                    'trans_email/ident_support/email',
                    MagentoStoreModelScopeInterface::SCOPE_STORE
                ),
                'name' => $this->scopeConfig->getValue(
                    'trans_email/ident_support/name',
                    MagentoStoreModelScopeInterface::SCOPE_STORE
                )
            ];

            $replyTo = $this->scopeConfig->getValue(
                'trans_email/ident_support/email',
                MagentoStoreModelScopeInterface::SCOPE_STORE
            );

            $transport = $this->_transportBuilder
                ->setTemplateIdentifier($this->scopeConfig->getValue(
                    self::XML_PATH_APPROVED_EMAIL_TEMPLATE,
                    MagentoStoreModelScopeInterface::SCOPE_STORE,
                    $storeId))
                ->setTemplateOptions(['area' => MagentoFrameworkAppArea::AREA_FRONTEND, 'store' => $storeId])
                ->setTemplateVars([
                    'testimonial' => $this,
                    'subject' => __('About Your Testimonial')
                ])
                ->setFrom($sender)
                ->addTo($this->getMbTestimonialEmail(), $this->getMbTestimonialName())
                ->setReplyTo($replyTo)
                ->getTransport();

            $transport->sendMessage();
            $this->inlineTranslation->resume();
        }
        catch (Exception $e) {
            //silence is gold
        }
    }
}