Allow me to help you and share some information about emailed invoices or estimates in QuickBooks Desktop.
Since QuickBooks Desktop is using your email provider in sending invoices or estimates, you can check your Sent Items folder in your email.
If your email profile hasn't been set up to save copies of sent messages, you can follow the steps below:
If you're using Outlook, open your Outlook email.
Go to the File menu.
If the Save copies of messages in Sent Items folder box already checked, let’s clear it and exit out of Outlook.
Once done, follow steps 1-4.
Then, go back to the Save messages section and check the Save copies of messages in Sent Items folder box.
You can get more details in this article: https://quickbooks.intuit.com/community/Help-Articles/Set-up-email-service/m-p/201268.
Let me know how it goes by leaving a reply below. I'm always here to help you out with emailing invoices or estimates via QuickBooks Desktop.
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