> On 4 Apr 2026, at 21:33, Eugene R via Postfix-users
> <[email protected]> wrote:
>
> 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
Add the following to main.cf:
header_checks = pcre:/usr/local/etc/postfix/header_checks
Then create or update /usr/local/etc/postfix/header_checks with:
/^X-Google-Group-Id:/i REJECT Mail from Google Groups is not accepted
This rejects messages containing the X-Google-Group-Id header, which is added
to emails sent through Google Groups.
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