Where's the spell check?
If your Preferred Editor Type is set to Rich Text Editor (in Preferences), then there is a Spell Check icon on the right in the Reply Editor toolbar. It says ABC with a check mark under the letters.
I personally like the built in spell check option in my Chrome browser better tho (FireFox has it too, you may need to enable it on your browser)... To use it you will need to hold down the Ctrl or Cmd key down while you right click on the underlined (misspelled) words tho. The Reply Editor's Spell check loads a little slow for me (and for a lot of other users), so this is an easy fix to work around that issue. It's a little awkward at first, but after doing it enough times, it gets more natural feeling.
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