Greetings, @steven24.

I appreciate you joining this conversation. Allow me to hop in and share information about sending estimates in QuickBooks Online (QBO).

In QBO, estimates and other sales forms that are being sent have a default From or outgoing email address, which is the <quickbooks@notification.intuit.com>. However, when the client replies to the email sent, it'll directly send it to the company email.

Let's check your company email and the template used for invoices and estimates. Here's how:

1. Go to the Gear icon at the upper-right. 
2. Select Account and Settings. 
3. From the Company menu, click the Contact info section. 
4. Look into the Company email and then Save and then Done.

To verify the template design of the default one, you can follow these steps:

1. Go back to the Gear icon, select Custom form styles.
2. Select the invoice template that's set to default or the one you used when sending these invoices or estimates. 
3. Go to the Emails tab.
4. At the right part of the window, you'll see a sample that has the Subject and From details. 
5. Click Done.

Also, before you send the estimate, a Send email window will help you verify first the email address, subject, and message body.

To learn more about managing and customizing sales forms in QBO, consider checking out this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.

For tips and other resources, you may also visit our website for future reference: QBO self-help articles.

Please click the Reply button below if you have more questions about estimates or anything else QuickBooks. I'm always here to help. Take care and have a good one.