You can no longer link your Dropbox account with Yahoo Mail. If you previously linked your Yahoo Mail account, you can unlink it by following the instructions below.
How to unlink your Dropbox account from Yahoo Mail
To unlink your Dropbox account from Yahoo Mail:
- Sign in to dropbox.com.
- Click your avatar (profile picture).
- Click Settings.
- Click the Connected apps tab.
- Click Disconnect to the right of your linked Yahoo! Mail account.