Fix “The Operation Could Not Be Completed” Apple Mail

Short answer:
If you see the error "The operation could not be completed", Apple Mail likely has no existing signature. Create a test signature manually, then run Update all signatures from the Xink menu.

Summary: This error in macOS Mail typically occurs when no signature exists in Apple Mail. Creating a manual signature allows Xink to complete the update process successfully.

You may see the following error when trying to update signatures in macOS:

Step 1: Create a test signature in Apple Mail

1. Open Mail.
2. Press Cmd + , to open Preferences.
3. Go to Signatures.
4. Click the + button and create a simple test signature.
5. Close the Preferences window.
6. Quit Mail by pressing Cmd + Q.

Step 2: Update signatures from Xink

Open the Xink menu and select Update all signatures.

Troubleshooting

• Still seeing the error? Check your iCloud configuration.

Set up iCloud Drive for the Xink Mac app

Next steps

After updating, reopen Mail and verify that your Xink signatures are available and working correctly.