Yahoo! Mail makes it easy to block unwanted messages from a known address. It's just as easy to remove the block if you want to.

Here's how to block an email address:

1. Click Options in the upper-right corner of your Yahoo! Mail page and select Mail Options.
2. Under "Spam", click Block Addresses.
3. Under "Add Block", enter the email address from which you don't want to receive mail.
4. Click Add Block.
5. The address now appears on your list of blocked addresses.

Yahoo! Mail offers up to 500 blocked email addresses. You can see how many of your blocked addresses you're using beside the list – for example, “4 of 500 used”.

You can also un-block addresses whenever you want.

To remove a block from an address:

1. From the Blocked Addresses list, click the address you wish to remove.
2. Click Remove Block beside your the Blocked Addresses list.

After removing an address from your Blocked Addresses list, you'll be able to receive mail from that address.

This isn't a great way to deal with spam, though, because spammers keep changing their From address and other information. For that, we have SpamGuard.