Hey @howardmarxb user permissions are limited to super admin users, so you can’t limit other users to do anything with super admin.
However, if you’re looking to limit which of your emails create/log to contact records from an external system you can just uncheck the “log to HubSpot” option when sending emails.
HubSpot doesn’t automatically create contacts or log incoming emails to your personal inbox. If this is happening, it means your email inbox has been set up as a conversations inbox, which is not recomended for a personal inbox as the function of this is to be a platform wide, team inbox and all incoming emails will be logged to the CRM. If this is the case, I would recomend discussing removing your email as an inbox email with your IT team/Super admin.