Hi gary_broom,
QuickBooks Online provides the ability to email your customers a copy of their invoice directly, so you can ensure it's received in a timely fashion. However, there is a current issue with Outlook and Yahoo emails. For this reason, I suggest exporting the invoice as a PDF, by clicking on Print or Preview at the bottom of the invoice screen, then save the PDF version to your computer where it's easy to locate. Then, attach it to an email using your external email provider. However, you can Connect QuickBooks to your Gmail account, by following this link.
Please don't hesitate to contact us outside of Community, if you would like to receive an email notification when the current issue has been resolved. We would be happy to add you to the list of affected users and ensure you receive status updates as they come available.
Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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Let us know if you have other questions. We would be happy to help!
