Yes, Donorbox sends automated donation receipts to your donors.  The receipt templates are customizable with your images and text.

Here is an example of what your receipts could look like.

You can also customize your email receipt by going to the "Email" tab of your campaign editor. 

Due to deliverability issues with spam filters, these emails will be sent from our email address (some email providers have strict SPF and DKIM rules that prevents other services such as Donorbox to send emails on your behalf). However, you can set the "Donor Receipt From Email" to your organization email address, which will set your organization email as the reply_to address and put your organization name as the "from" name. To do so, go to the "Receipt Email Settings" tab of your Account, type in your email address in the appropriate text box, and click "Update".