Filtering spam with Eudora for Mac OS Go to the Window menu in Eudora and select Filters. Click the New button at the bottom left corner. Make sure the Incoming box is checked. Next to Header: type in X-Barracuda-Spam-Flag: On the next line, select appears from the pull-down menu. Under Action, on the first pull-down menu select Transfer To and click the button that appears next to it. In the Transfer menu, select your spam mailbox (e.g. Trash) if you already have one, or click New... if not. If you click New..., type in a name for the mailbox you would like your spam to go to and click OK.