Hello,
As per your recommendation in issue Allow more custom email headers to filter mails · Issue #376 · zammad/zammad · GitHub I have created this (new) request. As long as you cannot use custom mail headers for filtering in Zammad it would be really nice to have Google g-suite specific SPAM recognition headers available.
These are:
X-Gm-Spam
X-Gm-Phishy
Values can be 0 or 1
Kind Regards,
Tilman