Hi there, iggyviljoen.
I'll help you modify the default message when sending your quotation from QuickBooks Online. Here's how:
- Go to the Gear icon and select Account and Settings.
- Proceed to the Sales tab, then click Messages.
- Click the drop-down under Sales form and select Estimate.
- Edit and customize the email message.
- Click Save.
You'll also want to personalise the estimate itself, your invoice, or sales receipt. Let me share these articles that can serve as your guide:
Let me know if you need anything else.