This "x" icon will permanantly remove the notification from your stream - as such, it is not possible to restore this information. Note: Each new thread in an email chain will have its own unique notification.
Would you be able to provide some more context around the problem you're seeing? It's not very clear from your description above. If you could include a screenshot, and details of the email client and browser versions you are using I can look into that particular error message and advise on next steps to resolve it.
I removed one of the tracked emails clicking the cross instead of muting it. See the screenshot in the previous message. Now I would like to get that email back in the list.
This "x" icon will permanantly remove the notification from your stream - as such, it is not possible to restore this information. Note: Each new thread in an email chain will have its own unique notification.