Can I fix the mail error when sending quotes from Quickbooks Online? The sales/invoice delivers to customer's e-mail address but not my quote/estimate form

Thanks for dropping by the Community today, @NikkyM. I'd be delighted to help you with sending your quotes to your customers in QuickBooks Online (QBO).

To start, may I ask what specific error message you encountered while sending the quotes to your customers? I'd appreciate any additional details that you can provide so I can help you out and provide you with the best solution.

To get rid of this problem, let's perform a few browser troubleshooting solutions to send the quotes from QBO. Have you tried clearing the cache or using other supported browsers? The private window will not save any history, making it a good place to identify browser problems. To start incognito mode, use these keyboard shortcuts:

• Google Chrome: press Ctrl + Shift + N  
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

If you're able to send your quotes using a private browser, go back to your regular browser and clear its cache. Clearing the cache or cookies is the best way to get a clean slate for your browser. Otherwise, using other supported browsers can be a good alternative too.

Additionally, I recommend reading this article that will guide you through personalizing your form designs and adding the information that matters the most to your business: Customise invoices, quotes, and sales receipts in QuickBooks Online.

Fill me in if you have additional questions about managing your quotes and invoices in QuickBooks. I'm always here to help. Take care always!