This morning I decided to check how to report abuse for the service in question. Their instructions said to forward the email in question to their abuse address.
I did that with an explanation of the situation. And I promptly got a "support ticket" reply but I couldn't find my sent email in my outbox.
I found it in my spam folder and Gmail was telling me I had reported my outgoing email as spam.
So I clicked "this is not spam" so I could have a record of the outgoing email. And it removed BOTH emails from my spam folder.
This seems not right. I want the incoming email listed as spam because it is.
But why would you list my outgoing forwarded email as spam just because I forwarded it from the spam folder? And why can't I uncouple the emails?
I don't follow the logic here at all.
But the business logic is a black box. It only aligns to your interests to the absolute minimum necessary.
Reverse engineering the black box is completely empirical.
Try a set of operations and see what happens. Repeat.
It is an ocean. It can’t be boiled.
If that fails look up their hosting provider ( https://www.whois.com ) and report it directly to them, you can also complain to your equivalent of the ICO ( https://ico.org.uk/make-a-complaint/nuisance-calls-and-messa... ) although they're mostly toothless.