Reverse order in checking mail config styles

src/Mail/MailManager.php

@@ -7,6 +7,7 @@
  * Overrides the Laravel MailManager
  * - Replaces the Laravel Mailer class with the Winter Mailer class
  * - Fires mailer.beforeRegister & mailer.register events
+ * - Uses another method to determine old vs. new mail configs
  */
 class MailManager extends BaseMailManager
 {
@@ -71,4 +72,29 @@ protected function resolve($name)
 
         return $mailer;
     }
+
+    /**
+     * @inheritDoc
+     */
+    protected function getConfig(string $name)
+    {
+        // Here we will check if the "mailers" key exists and if it does, we will use that to
+        // determine the applicable config. Laravel checks if the "drivers" key exists, and while
+        // that does work for Laravel, it doesn't work in Winter when someone uses the Backend to
+        // populate mail settings, as these mail settings are populated into the "mailers" key.
+        return $this->app['config']['mail.mailers']
+            ? ($this->app['config']["mail.mailers.{$name}"] ?? $this->app['config']['mail'])
+            : $this->app['config']['mail'];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getDefaultDriver()
+    {
+        // We will do the reverse of what Laravel does and check for "default" first, which is
+        // populated by the Backend or the new "mail" config, before searching for the "driver"
+        // key that was present in older version of Winter (<1.2).
+        return $this->app['config']['mail.default'] ?? $this->app['config']['mail.driver'];
+    }
 }