When several emails have been sent to the same receipents in a selected time period, I can't tell which email was the log is referring to. It would be very helpful to include the subject of the email that was sent to each participant - this will be far more valuable when confirming that an email was sent to a specific email address.
This has been implemented in 5.15.4342.3516.
Thank you for your idea. We will share it with the Development Team.