As an AI language model, I don't have access to current statistics but based on previous studies, the two time periods when most business email messages are opened are from 10:00 am to 11:00 am and between 2:00 pm to 3:00 pm. However, it's important to keep in mind that this may vary depending on the recipient's location and industry. Therefore, it's recommended to conduct a research analysis to identify the best time for sending business emails to a particular target audience.
