Merge pull request #15153 from snipe/fixes/mail_backup_config

Fixed env var for backup config - related to #14964

config/backup.php

@@ -139,7 +139,7 @@
             'to' => env('MAIL_BACKUP_NOTIFICATION_ADDRESS', null),
 
             'from' => [
-                'address' => env('MAIL_FROM_ADDRESS', '[email protected]'),
+                'address' => env('MAIL_FROM_ADDR', '[email protected]'),
                 'name' => env('MAIL_FROM_NAME', 'Example'),
             ],
         ],