[kl4m]

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.

[krapht]

In my experience, it is more they "share" spam documents with you.