| Avoiding Spam | Blocking Images | Blocking Specific Addresses |
You can block addresses that you don’t want to receive email from. All incoming messages from blocked addresses are automatically deleted, without bouncing back to the sender or going into one of your mail folders. If you want to block messages from a particular source, just set up a block on the sender’s address or entire domain. As long as the sender always uses the same mailing address or domain, this type of blocking is very effective.
Select Mail Options from the Options menu.

The General options page appears.
On the left side of the mail options page, select the Blocked Addresses option.

The right side of the page shows the addresses and domains that you have currently blocked.
In the Add an address box, type the email address or domain you wish to block, then click the plus button.
Tip: To block email messages from an entire domain (for example, baddomain.com), type the domain in this box.
The address is added to on the list.

To remove or unblock an address or domain from your list, select the entry, then click the trash icon.

The address or domain disappears from your list of blocked addresses.
Blocking specific addresses is not a particularly good strategy for preventing random spam because proficient spammers constantly change the addresses and domains that they use. But it can be a useful strategy if you get repeated junk messages from the same sender and want to block them.
Click one of the Learn More links below to learn more about Yahoo! Mail’s other anti-spam tools.