Most companies started using email marketing in 2012. When it comes to statistics, 70% of mails are opened within the first 16 hours. However, messages scheduled for Sunday are found to be resulting in high open and click rates.
On the other hand, messages scheduled for midnight witnessed 19.2% of open rate and 7.4% of clicking rate which is higher than the messages sent at 12 am. Additionally, messages that have 4-15 characters in subject line resulted in 15.2% of open rate.