> Domain reputation is a thing though. If your IP really gets blocked (and not just throttled; that's a signal you have access to btw) you usually have a bigger problem.
Unfortunately, that's not what I'm seeing in the real world. Everything is IP based. Go through the archives here at Mailops. Over the past month how many messages has this list gotten with request for help from Microsoft, Comcast, T-Mobile, etc all concerning their mail server IPs being blocked? They block by IP address. I'm not really saying that blocking by IP address is a bad idea. I get it. I get why it's so effective. I'm just saying you can't say you're acknowledging spam from certain domains or DomainKeys and then go and block the IP that's sending. You're comparing apples to oranges. I remember the early 00's with AOL's feedback loop. This was a wonderful, wonderful thing. It helped that a lot of people still had AOL email addresses. I could sign up all of my SMTP server IPs to funnel in spam feedback to a single email address. I could monitor that email address for feedback reports. The reports included all of the headers, including the message ID that I could parse through my logs to identify the sender. And then I could take action against that account on our server. But eventually AOL addresses died off and that FBL became dormant. I wish Gmail, Yahoo, Microsoft, all had similar feedback loops - that would be the most useful thing to me as a server administrator. I think Gmail may have something similar but it's useless because you have to send 100 million messages a day (or some absurd high number) to get the feedback loop to register a single incident. AOL's feedback loop from the 2000s was the pinnacle of feedback loops. I think instead of looking at something that lowly AOL did successfully, all of these big name mail service providers are taking the idea and trying to "improve" it to the point that it's ineffective.
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