You can view a log of all emails sent through the system by going to Library --> Sent Emails.
Once you are on the list of all the logs, you can filter the list to find specific emails sent by a particular person or emails sent on a particulate date etc. by using filter row below the column headings.
When an email is sent the log will display the number of emails sent as well as if any emails failed to be sent in the 'Failed' column. The details of which email address failed can be seen when viewing the details of the email.
To view details of an email that has been sent, double click on the row of the email and a pop-up will be displayed with 2 tabs. The 1st tab will display a list of all the recipients of thee email that received the email. This list does not include any additional contacts that were sent the email (they are displayed in the Email Details tab).
The Email Details tab displays the details of the email including any additional recipients that were added to the email.
If you would like to resend the email, you can click the Resend button to resend the email to everyone on the list.