The email collection tools in Campaign Monitor are totally free. You just pay when you send mail. When I was organizing Startup Bootcamp, I emailed both CM and

The email collection tools in Campaign Monitor are totally free. You just pay when you send mail. When I was organizing Startup Bootcamp, I emailed both CM and MailChimp to ask for a donation. MailChip offered us a discount, but CM gave us an extremely generous number of credits that easily covered our needs. Using CM is a breeze. Originally we were using a Google Doc as a signup, and felt the need to switch once we hit a few hundred people. Importing the data was effortless, and CM has built-in checks for both duplicate and malformed emails. Their analytics and reporting is also great. Highly recommended.