Hi Woodoer,
Thanks for reaching out here. Ensuring that you receive notification when your customers accept your quote, is beneficial in planning the work to be done. QuickBooks Online enables you to add or edit your email address, so you receive your customer response on time. I'd be glad to assist!
I suggest taking a look in your company settings by following these steps;
1. Click on Settings ⚙ and select Account and settings
2. Hit the Edit ✎ in the Company info section
3. Enter your email address in the Customer email field
Note; This is how your customers contact you. If this is blank, your company email will be used.
4. When finished hit Save and then Done
Here's how to add the email address to your forms;
1. Open your Settings ⚙ and then Custom form styles
2. Click Edit in the Action column for your form
3. Select the Content tab and then the Edit ✎ in the header section
4. Enter your email address
5. Hit Done
If you have any other questions, please don't hesitate to reach out again. We're always glad to help!