Same issue here with QuickBooks desktop 2020 , every time i send an invoice by email .

Out of Memory ???  Has been doing this off and on for the last year, really frustrating. I have been saving as PDF and sending by email but I should be able to just click send and have it go.

Some suggestions say to change email preferences , however I get the same Out Of Memory error as soon as I click on the "Send Forms" link under preferences. So I cannot change anything there ??

Have downloaded all the updates from windows and QuickBooks..

Any Ideas ??