It's my priority to ensure you can email invoices to your customers, @rainmaid.
The reason why you can no longer email invoices to my customers is that the version of QuickBooks Desktop you're using is an outdated one.
After May 31, 2022, access to add-on services will be discontinued for QuickBooks Desktop for Windows 2019 and previous versions. That includes sending emails, Payroll Services, Live Support, Online Backup, Online Banking, and other services. For more information, you may check out this article: QuickBooks Desktop service discontinuation policy.
If you wish to continue having the feature to send invoices, you may need to upgrade to a newer version of QuickBooks Desktop from within the program.
Once done, you can start emailing sales forms, invoices and statements. You can send them individually or as a batch, or save them to send when you're ready. For your reference, please see this article: Email sales forms, invoices, and statements in QuickBooks Desktop.
Feel free to comment below if you have further queries about sending emails in QuickBooks Desktop. I'll be happy to help you. Keep safe!
