Does BytePhase add new customers to Mailchimp automatically?

No, you decide who goes across. On the Customers list, tick the customers you want and click the Mailchimp button; for a lead, use the Subscribe to Mailchimp action. Each time, you enter the Mailchimp Audience ID and any tags. The bulk button appears on larger screens such as a laptop or desktop, not on a phone. Contacts then join your audience once they confirm Mailchimp’s opt-in email.