Hi, I need to change the email address invoices are sent from but the system won’t accept it as it ends with .agency

Thanks for sharing an update with us, Clare.

If you've set the email address as your new company email, then yes, it'll update on the invoice. Once you sent an invoice to your customer, the address will be shown on the invoice form.

If you don't want to change your company email address and just want to use the address as the sender, you'll want to add it as a customer facing email. Let me show you how.

1. Go to the Gear icon in your QuickBooks Online (QBO) account.
2. Select Account and settings.
3. Click the Company menu and select the Contact info section.
4. Enter an email address in the Customer-facing email field. 
5. Click Save and then Done.

If you're referring to changing the default email from (quickbooks@notification.intuit.com.), the option to do so isn't possible. This is to protect your account and prevent security risks. Suspicious email can sometimes be a scheme to get your personal info.

Furthermore, I'm adding this link that you can utilize in modifying your invoices and recording your customers' payments: 

• Customise invoices, estimates, and sales receipts in QuickBooks Online 
• Record invoice payments in QuickBooks Online

You're always welcome to tag me in your reply if you have any other questions about the invoice email address. I'm always here to back you up!