[pfx] Google groups spam

Hello!

I am sorry if this is off-topic. I hope people here could help.

Recently I am getting lots of (mostly backscatter) spam via Google 
Groups lists. At least, several screens of service headers look 
legitimate at first glance, although the listed group URL does not work 
and the group itself cannot be found. The messages come to various 
non-Google accounts.

I wonder
(1) Can something be done about this via a normal reporting process?
(2) What is a reasonable way to filter such messages?

Do you have any suggestions?

Thanks a lot
Eugene

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