Enhance the message when trying to change the default notification email address of a Project when the domain is correctly verified.

Problem Definition

When trying to change the default email address for the Project notifications to a different one but you don't have the correct permissions to proceed, the error says that the domain is not claimed:

That might be incorrect and seem to occur when the user is not one of the Org admins where the domain was claimed.

How to test this behavior:

1. Verify your domain, configure the DKIM & SPF records as described here.
2. Ensure that the domains are correctly claimed here.
3. Try to update a Project's email send while not being one of the Org admins.

Suggested Solutions

1. Enhance the error message so the user knows what need to be done to complete that task such as:

   It seems that you don't have the necessary permission to proceed with this change. Reach out to one of the Org admins of your site and as him/her to proceed with this change.