With Yahoo Mail, you may not have to struggle with spell-checking suggestions. You can choose not only from languages, but also often from dialects. Yahoo Mail can also look at the message you’re composing and determine what language it’s primarily written in.
You can select a Yahoo Mail dictionary for any message you write in Yahoo Mail. You can also change the default language. Here’s how.
These instructions apply to the new Yahoo Mail and may differ from the classic version.
Change Spell Check Language in Yahoo Mail
To select the language used to spell check in Yahoo Mail for a message you’re composing:
Start composing your message using text formatting. An expanded text message has additional formatting options at the bottom of the screen.
Right click on the message box and go to section Spelling and grammar and press Show spelling and grammar.
Menu in section Automatically by language you can select a new language. Click on the one you want.
Select Automatically by language to let Yahoo Mail choose the language you use for spell checking based on the language you use in the email you use most often. If your email contains multiple languages, only the language it chooses will be used.
Changing the language in this menu will make it the default language for all emails you write in the future.