How do I prevent email newsletters from going into spam?
- The reliability of the email service provider
- The subject line of the email (try this service for testing subject lines: http://www.subjectline.com)
- The content inside the body
The first thing w suggest is changing the subject line of your confirmation message as well as the contents of the confirmation message itself. Try different text and test things to see how that impacts the sending.
Additionally, make sure you've entered an email address and postal address in your newsletter Send Settings.