You can send a receipt to your entire donor base. To do this, visit the Account section of your dashboard, then the Receipt Settings page. Navigate to the Yearly Receipts tab.
If you click the orange 'Edit Settings' button, you can view and edit your year-end receipts template.
Once you're satisfied with how the receipts will look, click the Yearly Receipts tab at the top to fresh. Filter for the donors you wish to send the receipts to and click the applicable button at the bottom.
Please note: It may take up to 15 minutes for all of your donors to receive their receipt.