How can I remove an e-mail address from receiving notifications about specific form submissions?

You need to edit your form's notification email alert and change the "Recipient Email" address to any other desired email address on which you want to receive submission emails. Please check the screenshot below:

You may like to take a look at the following guide which should help you:   https://www.jotform.com/help/41-How-to-Find-and-Change-the-Email-Address-Used-for-Notification-Email 

Hope this helps.

Do get back to us if you have any questions. 

Please note that you can also add condition in your form to send submission email based on the user's answer of some form field. You may like to take a look at the following guide which should help you:  https://www.jotform.com/help/167-How-to-Send-Email-Based-on-User-s-Answer