The Email Log will show a list of all emails which have been delivered successfully. Here's where to find it.
System Monitor - Email Log
Step 1: Navigate to System Monitor.Step2: Select Email Log.
Email Log
The email log will show a list of all emails which have been delivered successfully. You can also access further details by double-clicking on a specific email. This action will open the email in an email client, allowing you to review its content and any attachments. Furthermore, you can utilize the search field within the email log to quickly locate a specific email based on criteria such as sender, recipient, subject, or date.
This functionality only works for emails sent by SMTP. For Exchange or Office 365 setups, successful emails will be shown in the "Sent Items" folder of the email account that was used to send the email.