If you are using Apple Mail you need to make sure that the iCloud Drive setting is correct.
Under Xink Preferences there is a setting called "I'm using iCloud Drive" that you should check if and only if you are using have an iCloud on your MAC.
The following explains how to determine if you are using iCloud Drive for Mail.
- Open System Preferences.
- Click "iCloud".
- Click the "Options" button next to "iCloud Drive".
- Scroll to "Mail".
If there is a checkmark next to "Mail", you need to choose "I'm using iCloud Drive in Xink app preference (Figure 1). If you aren’t using iCloud (there’s no checkmark next to “Mail”), then make sure "I'm using iCloud Drive" remains unchecked within Xink App.
Please see the following screenshots.