You can manually select up to 200 contacts or leads from a contact or lead list view.
You can send up to the daily list email limit by entering the list view name in the Recipients field. Or, click Send List Email from a Contact list view, Lead list view, or Campaign record without selecting any individual records.
List emails count against an org’s daily list email send limit, which is typically 5,000 emails per day. This limit doesn’t include individual emails you send.