A friend / client of mine used some kind of WordPress type of hosting service with a simple redirect. The host got on the bad sites list.
This also polluted their own domain, even when the redirect was removed, and had the odd side effect that Google would no longer accept email from them. We requested a review and passed it, but the email blacklist appears to be permanent. (I already checked and there are no spam problems with the domain.)
We registered a new domain. Google’s behaviour here incidentally just incentivises bulk registering throwaway domains, which doesn’t make anything any better.
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