Any good salesperson, marketer, or client communication specialist worth their salt spends a lot of time carefully constructing e-mails, from the perfect subject line to the ideal sign-off. But even the most savvy senders often overlook one of the most important parts of the process: the time of day you send your e-mails out. Research from MailChimp and HubSpot shows that emails that arrive between 9:00 a.m. and 11:00 a.m. (in the recipient’s time zone) are much more likely to get read than their later counterparts. Day of the week, however, doesn’t really matter. As long as it’s a weekday, the open rate should stay consistent.