Hi there, @pjke.

You've got me here to share some insights about viewing the list of emails that you've sent to your customers from the sales transactions.

At this time, you can view all the emails that you've sent to your customers by going to the Audit Log section in QuickBooks Online. This keeps track of your activities where you can see all the happenings on the account. Please know that viewing a specific list for all the transactions sent isn't available.

On the other hand, you can also enable the Email me a copy feature to receive your own copy of the emailed transaction moving forward.

Here's how:

1. At the top right, click the Gear icon.
2. Press on Account and Settings.
3. On the left pane, select Sales.
4. In the Messages section, you can enter the email address under Copy (Cc) new invoices to address.
5. From the Sales form drop-down, tick on Invoices and other sales forms.
6. Click on Save.
7. Hit on Done.

To give you more insights about what are the options that you can do to keep track of the emails that you've sent to your customers in the system, please see these links attached:

• Email a sales form or report to multiple email addresses
• Change the email address your customers see in QuickBooks Online

Know that our developers are constantly gathering and considering new features to be added to cope with your business needs. 

Let me know if there's anything else that you need. I'll be right here to provide continued support. Have a lovely day!