Reaching customers at the right time of the day can be the difference between getting your emails clicked and having them ignored. The only way to determining the optimal time to send to your customers is to test your campaigns.
Email Campaign Elements Routinely Tested to Optimize Performance 
According to research from MarketingSherpa, if just 47% of marketers test when to send an email to their in-house lists, that means over half of all email campaigns are not considering if their emails might be opened, links clicked or better conversion rate by changing the time or day of the week it is sent.
Many companies use the commonly accepted time of 11 am Eastern Standard Time to send emails. This is probably not ideal if you’re trying to generate leads, simply because many other email campaigns are also targeting this timeslot, cluttering the inboxes of the targeted recipients. The only way to know when is the best time of day to send your emails is to do some testing of your own.
Since every target audience is unique, optimizing your email strategy depends on the understanding the behaviors of your specific audience. In your testing, consider trying out times you wouldn’t think are optimal for emails. Record the data that you gain to build a record of your results. While finding the best time to send your email is an important part of delivering a successful email campaign, you will also want to test subject line, message, images, and layouts to maximize your results. When you find a time that increases email open rate, link click through, or conversions, make sure to still occasionally test the timing. Your email list changes over time so it is important to keep searching for the optimal time to reach your customers.
