I have plumbed the depths of the Adobe help and support site and scoured the interwebs. Can't find an answer.–lan–
I have correctly configured the Gmail helper with the 2-factor security and the special google password to enable lightroom to call gmail. I have uninstalled and reinstalled lightroom (even most recently wiped my drive and did a clean install of MacOS Catalina, after which I once again reinstalled lightroom.
I have successfully sent emails every time I did a complete reinstall and setup for Gmail. BUT it only works two or three time and then when I click send ... ta dahhh nothing happens!! Damn. I have found that if I delete the preferences .plist file it will work again but also only for a short time ... I've never had it work for more than a day since this problem reared its head about 2 weeks ago (could it have the 'virus'?). It always worked before and I don't think I've changed anything else.
I use email all the time to send some of my family images to my kids and grandkids .... waaaah. Please HELP.