The time when you send your email offers is nearly as important as the offer itself. It can be the difference between an email getting passed over or a customer opening and engaging with it. Delivering the right information at the right time can not only drive purchases, but also build customer loyalty.

This infographic by Retention Science shows how optimizing email delivery times can pay off, from a 55 percent boost in engagement to 33 percent increase in revenues. So when is the optimal time? The key is to test and test often. Use A/B split campaigns to test different days of the week and times of day. Measure open rates, click-through rates and response rates to determine the what’s going to make your customers, open, click and buy.