How to change the email logo

I am trying to figure out how to change a logo in the email settings but not having any luck

currently I have this logo in the email see attached and I would like to add a different logo. 

Is there any error message when you tried removing the logo? 

You can always create a new notification email and change the logo easily. Here's a guide: https://www.jotform.com/help/25-Setting-up-Email-Notifications

Please try it and let us know if the issue still persists.