It's bad enough that Google Drive/Docs notifications are treated as "external senders" so you have to open up your internal Google Groups to the world; then Goo

It's bad enough that Google Drive/Docs notifications are treated as "external senders" so you have to open up your internal Google Groups to the world; then Google Groups flags them as spam anyway! I'm guessing spammers may use Google Docs comments as a platform, but have never seen actual unsolicited Docs comments.