How to change email client from Outlook to eM Client in QuickBooks

I want to change the program QuickBooks uses to email invoices and reports from within Outlook to another mail program, like Thunderbird or eM Client, but cannot find out how to do that.  I set the default mail program to the desired mail client and it works properly for other applications but not QuickBooks. I don't want to use webmail.

Any guidance will be gratefully received.

Larry