Email types cannot be deleted to preserve previous information associated with a particular type, and can only be made inactive or hidden from selection.
- In your HubSpot Marketing account, navigate to Content > Content Settings.
- From the left side menu, choose Email > Email Types.
- Next to the name of the email type, click Edit.
- Scroll down to Edit email type and uncheck the checkbox next to Is this email type active?
- Click Save changes.