Our mass-email service is fairly limited, and we have no way to schedule periodic mailings, so you would probably want to handle the actual ecourse mailings via a third-party mailing list specialist such as MailChimp or GetResponse:
http://www.e-junkie.com/ej/tips.integration.mailing-list.htm
We just transmit the full order details to whatever URL you provide for your mailing list service, so what they do with that data is handled entirely at their end; we have no control or insight over that. This help page documents the data variables they will receive from us:
http://www.e-junkie.com/ej/help.integration.htm
We are not familiar with the capabilities of their system or how it works, so we can't tell you how to set things up at their end. Offhand, I would guess that you may need to create a separate list and have your ecourse buyers added to that specific list. You may need to use a particular subscription URL for that list, or they may have some way of looking at the item name or number in the order data and assigning the buyer to a list on that basis.
You can combine a general integration for all sales with product-specific integrations. The URL you enter in Seller Admin > Account Preferences > Common Notification URL would receive the order data for every order, regardless of which item(s) the buyer purchased. The URL you enter as the Payment Variable Information URL in a specific product's settings (for products that have "Send transaction data to a URL" enabled) would only receive the order data when that particular item is purchased.
