Using Thunderbird 66.0b1 as my default email with QuickBooks Enterprise 2019. About 3 weeks ago an update was installed, prior to the one today, that caused the email preview screen not to appear before sending emails out of QuickBooks. This use to provide an opportunity for me to write a comment in the email body before sending the email. Now they just get sent with no body info and the invoice or purchase order attached. My current work around is to save the PO or invoice as a PDF and then write the email in Thunderbird - which is a slow process.