Knowledgebase: eBay Integration
Ebay Module: Will my store send email notifications to eBay users if they purchase eProducts?

Unfortunately, no. As part of the eBay integration, there are guidlines set in place that 3dcart must adhere to. One such guideline is a restriction which will not allow their customers to be emailed from a 3rd party service (i.e. your 3dcart store), when the originating order was placed on eBay.

In the case of your 3dcart store eProducts purchased on eBay, you must use the eBay interface to send those customers their eProduct download links

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