How do I block someone from Yahoo messenger?

if you mean the messenger application. Click messenger top left in the messenger window scroll down click preferences then scroll and click ignore list. In the next window you will see where to add people to your ignore list or you could check ignore anyone not on my friend's list. then click o.k.

If you mean on Yahoo mail. To block all new chat invitations from users who are not in your Address Book please follow the steps below:

1. Click on Options at the top left hand of your mailbox.

2. Select Messenger Options from the drop down menu.

3. In the new window, click on Privacy from the left hand menu.

4. Check the radio button "Block all users not in my Contacts List. I will not be able to send or receive messages from users not in my Contact List."

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