Google this question: "What is the Best Time to Send Marketing Emails?" and you'll get over 4 million results! Email marketing companies all claim to have the answer. But the real answer is:
Yeah. It depends on the type of business -- whether it's B2B or B2C and who your Target Market is.
This infographic from Propeller CRM shows when certain target market segments are most likely to open an email as well as click on a link in the email.