how do i chek my speling in mailspring?
Mailspring automatically checks your spelling as you type in the composer. Misspelled words will be underlined in red. You can right-click to choose from a list of suggested corrections or add the word to your dictionary.
For more information about how Mailspring implements spellcheck and how to adjust the spellcheck language, see: Setting the Spell Check Language
For performance reasons, Mailspring will only mark only the first ten misspellings in each draft.