ClassroomParent provides highlevel statistics for your email use. To see them, go to Admin/Email.
This page contains a display of the last 30 days with counts of the number of emails sent, and related stats.
A couple of notes on the open rates. These are not unique opens, so a parent that reads the email in the morning, then again at night will count as two opens, as it will if a parent forwards the email to another parent and they open it.
Also, you will see days when you didn’t send any emails, but there are opens. This is because a parent may open an email from a previous day.