Yes, donors can easily connect directly with the campaign author.
Here are the steps to do that:
1) On the campaign page, scroll to the bottom of the page (below the story), you will see the box that says: "Email Author" with their name
2) Click on the "Email Author" box and an "Ask the Author a Question" box will open
3) Just type in your email address and your message, click "Ask"
That's it! Your email has been sent.