Option to set email to private and not log it

Absolutely need this. We use Hubspot to manage multiple companies and we need confidential emails sent from one domain to another domain to absoilutely not be logged or tracked - the the Sales extension ‘Log in CRM’ tool function is at the individual level and can not be set globally by a super admin, but even that would not be sufficient - certain executives, for very valid reasons, do not want any of their email logged or tracked no matter who they send it to.