PHP Deprecated

Hi guys,
I’m seeing a bunch of PHP Deprecated messages in my debug log:

PHP Deprecated: Creation of dynamic property YaySMTP\PhpMailerExtends::$SMTPSecure is deprecated in /wp-content/plugins/yaysmtp/includes/PluginCore.php on line 158
PHP Deprecated: Creation of dynamic property Google_Service_Gmail::$serviceName is deprecated in /wp-content/plugins/yaysmtp/vendor/google/apiclient-services/src/Google/Service/Gmail.php on line 104
PHP Deprecated: GuzzleHttp\Psr7\Uri::isSameDocumentReference(): Implicitly marking parameter $base as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/psr7/src/Uri.php on line 243
PHP Deprecated: GuzzleHttp\HandlerStack::create(): Implicitly marking parameter $handler as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/HandlerStack.php on line 39
PHP Deprecated: GuzzleHttp\HandlerStack::__construct(): Implicitly marking parameter $handler as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/HandlerStack.php on line 53
PHP Deprecated: GuzzleHttp\Handler\StreamHandler::invokeStats(): Implicitly marking parameter $response as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/Handler/StreamHandler.php on line 75
PHP Deprecated: GuzzleHttp\Middleware::tap(): Implicitly marking parameter $before as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/Middleware.php on line 125
PHP Deprecated: GuzzleHttp\Middleware::tap(): Implicitly marking parameter $after as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/Middleware.php on line 125
PHP Deprecated: GuzzleHttp\Middleware::retry(): Implicitly marking parameter $delay as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/guzzle/src/Middleware.php on line 168
PHP Deprecated: Google\Auth\Middleware\ScopedAccessTokenMiddleware::__construct(): Implicitly marking parameter $cacheConfig as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/google/auth/src/Middleware/ScopedAccessTokenMiddleware.php on line 70
PHP Deprecated: Google\Auth\Middleware\ScopedAccessTokenMiddleware::__construct(): Implicitly marking parameter $cache as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/google/auth/src/Middleware/ScopedAccessTokenMiddleware.php on line 70
PHP Deprecated: Calling get_class() without arguments is deprecated in /wp-content/plugins/yaysmtp/vendor/google/apiclient/src/Http/REST.php on line 58
PHP Deprecated: Google\Auth\HttpHandler\HttpHandlerFactory::build(): Implicitly marking parameter $client as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/google/auth/src/HttpHandler/HttpHandlerFactory.php on line 31
PHP Deprecated: GuzzleHttp\Promise\FulfilledPromise::then(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 26
PHP Deprecated: GuzzleHttp\Promise\FulfilledPromise::then(): Implicitly marking parameter $onRejected as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 26
PHP Deprecated: GuzzleHttp\Promise\PromiseInterface::then(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/PromiseInterface.php on line 29
PHP Deprecated: GuzzleHttp\Promise\PromiseInterface::then(): Implicitly marking parameter $onRejected as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/PromiseInterface.php on line 29
PHP Deprecated: GuzzleHttp\Promise\Utils::queue(): Implicitly marking parameter $assign as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/Utils.php on line 24
PHP Deprecated: GuzzleHttp\Promise\Promise::__construct(): Implicitly marking parameter $waitFn as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/Promise.php on line 23
PHP Deprecated: GuzzleHttp\Promise\Promise::__construct(): Implicitly marking parameter $cancelFn as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/Promise.php on line 23
PHP Deprecated: GuzzleHttp\Promise\Promise::then(): Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/Promise.php on line 31
PHP Deprecated: GuzzleHttp\Promise\Promise::then(): Implicitly marking parameter $onRejected as nullable is deprecated, the explicit nullable type must be used instead in /wp-content/plugins/yaysmtp/vendor/guzzlehttp/promises/src/Promise.php on line 31
PHP Deprecated: Creation of dynamic property Google_Service_Gmail_ListSendAsResponse::$sendAs is deprecated in /wp-content/plugins/yaysmtp/vendor/google/apiclient/src/Model.php on line 109
PHP Deprecated: Creation of dynamic property Google_Service_Gmail_SendAs::$smtpMsa is deprecated in /wp-content/plugins/yaysmtp/vendor/google/apiclient/src/Model.php on line 120
PHP Deprecated: Calling get_class() without arguments is deprecated in /wp-content/plugins/yaysmtp/vendor/google/apiclient/src/Http/REST.php on line 58

Please let me know if there’s anything I need to be concerned about, or if I’m okay to suppress the PHP Deprecated notice until an update is released.

Thank you!