You can view the list of emails that were sent from your account including sales emails. From the main menu just click on Reports > Email Delivery.
In the Date column click on the date you would like to see reported. If any emails were sent that day you will see that listed in the Email Type column. For sales emails that were sent you will see a blue Sale Notice, also shown there will be columns for how many emails were sent, how many were delivered to the clients email addresses how many were dropped and also how many were opened and not opened. Click on the Sale Notice text to see who the emails were sent to, which gallery they are associated with and also the date and time the email was sent.