Send a mass email from a spreadsheet
One more lesson learned from my first Kickstarter.
Once The Webcomics Handbook was finished, I was faced with the perplexing problem of how to deliver 1,016 different download codes to the same number of backers. Sending individual e-mails was out of the question. Using Dropbox was an option, but since I was going to begin selling this book digitally, I wanted to keep everything in one place. I was also concerned about the ability to distribute updates to the book as the need arose.
So I chose Gumroad. They kindly agreed to create 1,016 download codes for me, but I still had to figure out how to get those e-mailed to all of my backers.