HubSpot Email Marketing Certification How Many Contacts Do You Need On Your List To Run An A/B Test? April 17, 2020Knowledge GlassComments Off on How Many Contacts Do You Need On Your List To Run An A/B Test? At least 1,000 At least 50 At least 2,000 At least 500 Download HubSpot Email Marketing Certification Exam Answers (PDF)