You can send your receipt to your entire donor base. To do this, go to your Donors page and find the 'Send All Receipts' button.

When you click on it, a pop-up window will show a preview of the email. Click on 'Send Receipts' to mass email all your donors with the 2017 Year-end Receipt.

It might take up to 15 minutes for all your donors to get the email.