I read through several months of Google Group posts (which come as emails but which can also be viewed by visiting the Google Group and signing into Google if you aren't already signed in...that is also where you can change your settings or remove yourself from the Google Group).
I identified 7 apparent addresses involved in the airduct cleaning spam. I deleted four of them, the other three, I have no idea how they were able to post in our Google Group unless another admin deleted them and didn't mention it.
There are 28 membership requests I have never approved but which I have also not deleted because someday I hope to discuss them with the other three members of leadership...they have different situations.
I hope this helps, I hope not to fall for any of it in the future!
Thanks,
Becky