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Hi @sweetu ve ,
SharePoint 2013 workflow only sends to users known by the tenancy (i.e. those with accounts), it cannnot send email to external users. You could refer to this post: how-do-you-send-emails-to-external-email-address-in-sharepoint-online-workflows
Here are two options for you:
- Use SharePoint 2010 workflows. (Not recommended, 2010 workflow will be turned off in SharePoint Online).
- I would suggest you use Power Automate/flow, Microsoft Flow does NOT have this limitation.