Cant send sales invoices by email from quickbooks online. Says eror email not delivered

Hello, useraccountancy.

We received similar reports about not being able to send invoices via email. I encourage contacting our support team and providing them the investigation number INV-71760 to include you on the list of affected users. Our engineers are currently working to resolve this as soon as possible. 

However, you can use these workarounds that will enable you to send invoices outside of QuickBooks: 

• You can save your invoice as a PDF and send it via email through your business or other email address.
• You can send your customer a link to their invoice through SMS or messenger service. Simply click on “save and share link” then select “copy link” and paste it into your SMS or messenger service.
• If you have a Gmail or G-suite email account, you can use the send with Gmail feature to send invoices from your own address.
• You can save your invoice as a PDF, print it, and send it to your customer via mail.

 I’m adding some links below for additional resources. These articles will guide you on how to troubleshoot email delivery issues.

• How to view a list of bounced emails with delivery errors.
• Delivery Errors when trying to email a sales form.

We appreciate your patience as we're working on this. Please let me know in the comments down below if you have any other questions aside from not being able to send invoices via email. I'll be around to help you again.