What’s the best time to send email? We analyzed billions of email opens to find out.

Sending your email at the wrong time can derail the most well-crafted campaign. Knowing when your audience is most likely to open your emails is crucial, so it’s no surprise that many email marketers put significant effort into optimizing their send times to make sure messages reach subscribers when they’re actively checking their inboxes.

But what’s the best time to send email? It depends! We analyzed billions of email opens by time of day and found that the results are heavily impacted by geolocation and device usage.