Spell check whilst typing in EasyMail and other Windows Store apps will be for the language you have selected in the taskbar.
Now you can use the language selector (Microsoft call it ‘Input Indicator’) on the right-hand side of the Windows taskbar to switch between the language you want to type in (or use Windows Key + Space Bar to switch language instead). This is important as your new language is only for typing Sometimes Windows Sync settings dont copy properly, and allowing them to reset can solve problems you may have. Verify the settings here are correct for your mail service. To change the language of theses features you must add a second language to Windows itself. Spell checking and autocorrect are global Windows 10 features.
