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Tony,

Is it not possible to see if it was the ISP marked the message as
spam? _or_if it was the Subscriber?

The information provided in FBL reports apparently varies with different email services. Mark has said that the ones causing this trouble do not provide any detail on why the message was reported.

I once suggested he use a heuristic to distinguish this: look at the delay from message delivery to it appearing in an FBL report. If the delay is on the order of 30 days or more then likely the message was auto-deleted from a spam folder. If it is relatively prompt (a day or two) it is likely the user marking it spam.

Mark was skeptical of this, noting that the email services tend to run their FBL reports in batches, so the timing would be suspect in either case. I don't know if he ever looked into the statistics to see if there would be a chance of making that work.

Simultaneously Groups.io tell the subscriber, if if possible, that
their ISP is denying delivery of emails they have subscribed for.

Delivery isn't being denied (that would be a "Bounce", aka message rejection). Rather delivery is being diverted to the member's spam folder.

Shal


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