If some of your Gmail labels do not appear within Postbox, please try these steps:
- Quit Postbox.
- On the web, please go into Gmail's Settings / Labels. Make sure that the missing label has "Show in IMAP" selected.
- Start Postbox, and then from the File menu, select "Subscribe." Under your Gmail account, look for the missing label and make sure that Postbox has subscribed to it.
- Restart Postbox just to make sure every gets synced properly.