How can I customize the email address used to send invoice so that our company email domain appears?

I'm happy to assist you in customizing your email address for invoices, Tanya.

Currently, we're unable to customize the email address used to send your invoices as it's a default domain by QBO. However, we can show your email address on the invoice instead. Here's how:

1. Go to the Gear icon. 
2. Select Custom Form Styles, and choose Edit or New Style.
3. Click Content and then select the upper box to show the context.
4. Hit Done after checking.

Check out this article if you are using the Gmail domain on your company email address: Use your Gmail address to send invoices in QuickBooks Online.

Additionally, let me share these articles to help you with your emails and customizing your quotes and sales receipts:

• Change your customer-facing email address
• Customise invoices, quotes, and sales receipts in QuickBooks Online

I'll be here if you still have questions about managing your invoices. The Community is here 24/7 to assist you. Have a wonderful day ahead.