HubSpot Email Marketing Certification True Or False? On Average, For Every Dollar Spent On Email, It Has Consistently Produced Anywhere From A $40-44 Return. April 17, 2020Knowledge GlassComments Off on True Or False? On Average, For Every Dollar Spent On Email, It Has Consistently Produced Anywhere From A $40-44 Return. True False Download HubSpot Email Marketing Certification Exam Answers (PDF)