If spelling isn't your thing, business emails are really going to be a pain. No one wants to send misspelled emails, so let Microsoft Outlook automatically check emails before sending them.

The best way to deal with spelling errors in an email is not to make them in the first place, and that's where Outlook can help. The Microsoft Outlook client has a setting that forces the spell check to run after you click the "Send" button. If no errors are found, the email is sent as usual; if a spelling error is detected, Outlook gives you the option to correct it before sending the message.
To enable this setting, open the Outlook desktop app and click File > Options.

In the Mail > Compose Messages section, toggle the “Always check spelling before sending” checkbox.

Click “OK” in the lower right corner to save and close the “Options” panel.

The settings are complete. Now, when we click “Send” on an email with a spelling error, Microsoft Outlook will detect and give us the opportunity to change it.

If you find something in the email that the spell checker didn't catch and you want to change it, click “Cancel.”

This will open a dialog box that allows you to cancel sending the email. Click “No” to prevent the email from being sent.

Information source: howtogeek.com
