Want to know what the best times are to send your email campaign? According to Vertical Response:
Unique open rates averaged 21.7% from 8pm to 11:59pm and 17.6% for 12am to 4am. Moreover, this late night group was more likely to click through, with open rates of 4.2% and 3.2%.
…emails sent on Mondays had the highest ROI, but emails sent on Friday had a higher click through rate…
You need to read the article. It includes some good insights into the need to test your email and the move to mobile.
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Source: The Surprisingly Best Times to Send Your Email Marketing Campaigns || Vertical Response