Thanks for bringing this to our attention, @edvall.
As per checking, we have an ongoing investigation about QuickBooks Desktop (QBDT) being unable to send emails to Outlook. We have identified an issue with the early preview builds of Office 365 version 2402 build 17328.20068, and later. If you're part of the Microsoft Insider program and have access to Office 365 updates, you're using Outlook builds that are being tested and could cause problems with third-party programs such as QBDT.
As a workaround, you can set the QBDT Preferences to Webmail and choose a different email provider. Here's how:
- Go to Edit and select Preferences.
- Click Send Forms.
- Select the Webmail radio button.
- Click Add.
- Choose a different email provider, then fill out the Add Email fields.
- Click OK to save your changes.
Alternatively, you can save the invoice as a PDF and manually email it to your Outlook account. To do that, open the invoice, click the Print dropdown, then Save as PDF.
We also recommend consulting an IT professional to get the latest public release of Office 365, which is version 2401 build 17231.20236. To find your build number, open Outlook, select File, click Office account, then About Outlook.
While the investigation is ongoing, I suggest contacting our customer support team to add you to the list of affected users. This way, you'll receive email updates about the status of the investigation.
Furthermore, you can create custom templates for forms, such as invoices, to modify how they look and what information to include.
Keep in touch if you require further guidance about sending invoice emails in QBDT. The Community team is here to help whenever you need it. Stay safe.
