Is there a way to send Emails from workflow to users outside the AD. For e.g. I want to send emails to firstname.lastname@example.org from my workflow.
I'm using SharePoint 2013 on premise and 2010 workflows are not an option.
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Due to security enhancement in SharePoint 2013 workflows to enable the users to get approval from the administrators before sending emails to the external users.
there is a workaround for it, you have to work with user profile service.
One more thing, if you are using exchange them make sure SharePoint server should added into exchange relay