If some spam messages are sneaking through Yahoo! SpamGuard Plus and still making it to your Inbox, you can:

• Report messages as spam by clicking Spam. This trains your Yahoo! SpamGuard Plus filter to recognise this type of message and to send it to the Spam folder.
• If you don't expect any more legitimate or useful email to be sent to the disposable address that's getting spam, just delete the address. Here's how:
1. Click Options in the upper-right corner of your Mail page and select Mail Options.
2. Under "Spam", click AddressGuard.
3. Toward the bottom of the page, click Set up a disposable address.
4. Click the address you want to delete.
5. Click Delete, or press Delete on your keyboard.
6. Confirm the deletion by clicking Delete Disposable Address.