diff -u b/smtp.module b/smtp.module
--- b/smtp.module
+++ b/smtp.module
@@ -123,7 +123,7 @@
     ]);
     return FALSE;
   }
-  finally{
+  finally {
     $system->debug();
   }
 
diff -u b/src/Plugin/Mail/SMTPMailSystem.php b/src/Plugin/Mail/SMTPMailSystem.php
--- b/src/Plugin/Mail/SMTPMailSystem.php
+++ b/src/Plugin/Mail/SMTPMailSystem.php
@@ -130,7 +130,7 @@
    *   The file system service.
    * @param \Symfony\Component\Mime\MimeTypeGuesserInterface $mime_type_guesser
    *   The file mime type guesser service.
-   * * @param \Drupal\Core\Render\RendererInterface $renderer
+   * @param \Drupal\Core\Render\RendererInterface $renderer
    *   The renderer.
    * @param \Symfony\Component\HttpFoundation\Session\SessionInterface $session
    *   The session.
diff -u b/tests/src/Unit/Plugin/Mail/SMTPMailSystemTest.php b/tests/src/Unit/Plugin/Mail/SMTPMailSystemTest.php
--- b/tests/src/Unit/Plugin/Mail/SMTPMailSystemTest.php
+++ b/tests/src/Unit/Plugin/Mail/SMTPMailSystemTest.php
@@ -330,8 +330,7 @@
    * Test mail() with missing header value.
    */
   public function testMailHeader() {
-    $mailSystem = new
-    SMTPMailSystemTestHelper(
+    $mailSystem = new SMTPMailSystemTestHelper(
       [],
       '',
       [],