Hi there, @Calagara.

Having a sent folder in QuickBooks would be awesome! Right now, there isn't a way to look back at the emails you sent from QuickBooks Online. I encourage you to add your vote for this one by sending a request within QuickBooks. They're always looking to the opinions of users like yourself when determining how best to improve QuickBooks.

Here's how:
 

1. Select the Gear icon at the top, then Feedback.
   
2. Enter your comments or product suggestions then select Next.
3. You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4. From the drop-down, choose the appropriate category, then select Send message.

In the meantime, you'll want to locate the sales receipts and resend them. You may also activate the Email me a copy feature to receive your own copy of the emailed transactions moving forward. This way, you have the option to forward them to your donors right from your email service.

1. Go to the Gear icon in the upper right corner.
2. Choose Account and Settings.
3. Click the Sales tab on the left.
4. In the Messages section, hit the Edit icon.
5. Put a check-mark in the Email me a copy at [your email address] box.
6. Select Save and Done once you're finished.

Should you have any additional questions or concerns, the Community will have you covered. Thanks for reaching out, best wishes.