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In classic Outlook, go to File > Options.
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On the Mail tab, clear the check box next to Always check spelling before sending.
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In the email message you're composing in new Outlook, on the Options tab, select Editor > Editor settings.
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Under Corrections, slide the Spelling toggle control rightward to turn it off.
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To modify Editor settings in Outlook for Mac, in a new email message, go to Outlook > Settings and select Spelling & Grammar.
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In Spelling settings, clear the Check spelling as you type checkbox.
