diff --git a/mailstream/mailstream.php b/mailstream/mailstream.php
index a8306cef..f53d4fe9 100644
--- a/mailstream/mailstream.php
+++ b/mailstream/mailstream.php
@@ -66,10 +66,9 @@ function mailstream_module() {}
 /**
  * Adds an item in "addon features" in the admin menu of the site
  *
- * @param App $a App object (unused)
  * @param string        $o HTML form data
  */
-function mailstream_addon_admin(App $a, string &$o)
+function mailstream_addon_admin(string &$o)
 {
 	$frommail = DI::config()->get('mailstream', 'frommail');
 	$template = Renderer::getMarkupTemplate('admin.tpl', 'addon/mailstream/');
@@ -103,14 +102,14 @@ function mailstream_addon_admin_post()
  */
 function mailstream_generate_id(string $uri): string
 {
-	$host = DI::baseUrl()->getHostname();
+	$host = DI::baseUrl()->getHost();
 	$resource = hash('md5', $uri);
 	$message_id = "<" . $resource . "@" . $host . ">";
 	Logger::debug('mailstream: Generated message ID ' . $message_id . ' for URI ' . $uri);
 	return $message_id;
 }
 
-function mailstream_send_hook(App $a, array $data)
+function mailstream_send_hook(array $data)
 {
 	$criteria = array('uid' => $data['uid'], 'contact-id' => $data['contact-id'], 'uri' => $data['uri']);
 	$item = Post::selectFirst([], $criteria);
@@ -138,11 +137,10 @@ function mailstream_send_hook(App $a, array $data)
  * mailstream is enabled and the necessary data is available, forks a
  * workerqueue item to send the email.
  *
- * @param App $a    App object (unused)
  * @param array     $item content of the item (may or may not already be stored in the item table)
  * @return void
  */
-function mailstream_post_hook(App $a, array &$item)
+function mailstream_post_hook(array &$item)
 {
 	mailstream_check_version();
 
@@ -414,7 +412,7 @@ function mailstream_send(string $message_id, array $item, array $user): bool
 		$template = Renderer::getMarkupTemplate('mail.tpl', 'addon/mailstream/');
 		$mail->AltBody = BBCode::toPlaintext($item['body']);
 		$item['body'] = BBCode::convertForUriId($item['uri-id'], $item['body'], BBCode::CONNECTORS);
-		$item['url'] = DI::baseUrl()->get() . '/display/' . $item['guid'];
+		$item['url'] = DI::baseUrl() . '/display/' . $item['guid'];
 		$mail->Body = Renderer::replaceMacros($template, [
 						 '$upstream' => DI::l10n()->t('Upstream'),
 						 '$uri' => DI::l10n()->t('URI'),
@@ -480,11 +478,10 @@ function mailstream_convert_table_entries()
 /**
  * Form for configuring mailstream features for a user
  *
- * @param App   $a    App object
  * @param array $data Hook data array
  * @throws \Friendica\Network\HTTPException\ServiceUnavailableException
  */
-function mailstream_addon_settings(App &$a, array &$data)
+function mailstream_addon_settings(array &$data)
 {
 	$enabled   = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'mailstream', 'enabled');
 	$address   = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'mailstream', 'address');
@@ -528,11 +525,10 @@ function mailstream_addon_settings(App &$a, array &$data)
 
 /**
  * Process data submitted to user's mailstream features form
- * @param App $a
  * @param array          $post POST data
  * @return void
  */
-function mailstream_addon_settings_post(App $a, array $post)
+function mailstream_addon_settings_post(array $post)
 {
 	if (!DI::userSession()->getLocalUserId() || empty($post['mailstream-submit'])) {
 		return;