Quickfix for problems with the SmtpTransport

src/Mail/MailerServiceProvider.php

@@ -70,6 +70,9 @@ class MailerServiceProvider extends ServiceProvider
         $transport = $this->app->make(SmtpTransport::class, [
             'host'       => $config['host'],
             'port'       => $config['port'],
+            'encryption' => $config['encryption'],
+            // TODO: The security variable should be removed in the future
+            // https://github.com/swiftmailer/swiftmailer/commit/d3d6a98ab7dc155a04eb08273db7cd34606e7b5e#commitcomment-30462876
             'security'   => $config['encryption'],
         ]);