Spell-check your Yahoo Mail
Most web browsers check for spelling errors while you're composing your emails.
Spell check in web browsers
Your web browser will highlight errors and many will offer suggestions for correct spelling.
Web browsers with spell checkers:
Write emails in more than one language? Most web browsers default to spell checking for only one primary language. If the you write emails in multiple languages, check your browser's help pages to learn how to adjust the settings to include multiple languages.