When you select recipients for a marketing email, you can exclude specific contacts or lists from receiving the email.
Please note: if a contact is included as a recipient on the Individual contacts tab, they'll receive the email even if they're a member of a list you're excluding. If you don't include a contact as a recipient in the Individual contacts tab but they are a member of an inclusion list and an exclusion list that you've specified in the Lists tab, that contact will not receive the email.
To exclude lists or contacts when sending a marketing email:
In your HubSpot account, navigate to Marketing > Email.