Hi there, @CM99.

It isn't the impression we want you to have. Allow me to share some information about sending invoices from a different domain.

Do you mind sharing your company domain? Currently, we can only connect QuickBooks Online (QBO) to a Gmail account. If you wish to remove the old one and replace it, follow these steps:

1. Create an invoice or open an existing one.
2. Once you fill out the necessary fields, click Save and send.
3. Above the customer’s email, select the From dropdown.
4. Choose Remove Gmail address.

Once disconnected, QBO uses the default email to send invoices. You may now link and use your new one.

Having the ability to connect other domains would be great option. I encourage you to add your vote for this one by sending a feature request in the Feedback section within QuickBooks. Our product development team reviews all the feedback we receive to ensure we’re meeting the needs of our customers.

Here's how:
 

1. Select the Gear icon at the top, then Feedback.
   
2. Enter your comments or product suggestions then select Next.
3. You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4. From the drop-down, choose the appropriate category, then select Send message.

For your reference, check out this link: How to Submit Feedback.

Finally, please be mindful about sharing any personal or private business information here in the Community as this is a public forum. I've encrypted your email address for your security. 

Comment down below if you need further assistance with sending your forms. The Community is always here to help you again.