To prevent logging emails sent to specific recipients, add them to the Never Log list in your HubSpot account. Emails sent from a connected inbox with the HubSpot Sales extension to addresses or domains on this list will not create a new contact record, record email tracking activity on the contact's timeline, or be logged to the record. If you send an email directly from the CRM, it will still send but the email will not be logged in the record. HubSpot will still record email tracking activity for all recipients in your activity feed.
You can also exclude recipients from CRM logging when sending emails from Gmail or Outlook.
Please note: if there are recipients on an email who are not on the Never log list, HubSpot will log emails to those contact records.