Outlook 2013 not sending emails since Windows 10 upgrade

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Windows 10, Outlook 2013

The solution suggested on various forums is to run ‘sfc /scannow’ from an Administrator Command Prompt and then restart Outlook.

In my case emails were sitting in the Outbox and the ‘Outlook Send/Receive progress’ dialog wasn’t showing any errors.

I also had to open the email in question from the Outbox and hit ‘Send’ again.