V tej mail app to je v nastaveniach
https://support.office.com/en-us/article/Create-re ad-and-respond-to-messages-in-Mail-for-Windows-10- 8a301e64-10e2-46db-a03a-2e509e5ca93a?ui=en-US&rs=e n-US&ad=US
kapitola Check spelling tam kliknes na to abc alebo tu sipku dole a vyberes si ze to nechces.