In the new Yahoo! Mail, you don’t do this with your browser anymore. Now, just change your character encoding setting right in Yahoo! Mail!

Here’s how:

1. In the toolbar, click More Actions and select Set Encodings.
2. From the list that appears, select the encoding that matches the message’s content.

Note: Only one character encoding set may be viewed at a time. And in this case, changing your browser’s encoding setting will not work.