How to I manage the bounce list?

Do you mean to remove the email address from the bounce list? If so, you may remove the email address from the bounce list by following the steps in the guide below:

https://www.jotform.com/help/262-How-to-Remove-Your-Email-Address-from-Bounce-List

Generally, the email addresses are added to the bounce list when the emails sent are failing repeatedly due to any reason. Also, please check the following guide that can help you with troubleshooting email delivery issues.

http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues 

Hope this information helps! Let us know if you are referring something different. We will be happy to help.