Comment by fc417fc802 5 hours ago
If they don't provide an easy opt-out link then why not just block the sender and move on? Unlike the less legal operations I wouldn't expect a legitimate business to rotate domains or otherwise attempt to evade blocks.
I prefer to only report genuinely malicious behavior. As long as there's no active attempt at block evasion I figure reporting it is just increasing noise and generally making things worse for everyone. It's the active block evasion crowd that make any and every network communication protocol a pain in the ass to use at scale. It wasn't simpletons using a single static IP address that triggered such widespread adoption of Anubis overnight.
Why block when you can report to Spamhaus?