Why do emails show up in the bounce list??

why does this happen and how can it be prevented?

Sorry for the problem you are having.

There are several reasons why your email address may have been added to the bounce list. It could be due to a non-existent/inactive email address, your mail server being unavailable, your email server has rejected the emails due to suspected spam, your mailbox is full or JotForm is on your blacklist.

Please follow these links to know how to prevent bouncing related issues:

https://www.jotform.com/help/208-How-to-Prevent-Email-Bouncing-Related-Issues

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

If you have any further query or issue, please let us know.