Restrict Guest Checkout

How can we restrict guest checkout? when a guest is check out no mail is sent to him.
I want to check out only registered users. How this can be restricted?
Thanks

This was possible in earaly versions but was removed after some reconstructions. No plans of re-entry as login requirement may result in loss in sales conversion.

Please consider an SMTP solution if your host fails to deliver e-mails. http://litecart.net/addons/addon?addon_id=75

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View code on GitHub