We chose a different path @postmarkapp. We share our real-time delivery rates and times to inbox (per ESP) publicly: https://status.postmarkapp.com
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That applies to all ESPs. They can't always have perfect reputation
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my guess is cheap/free layers get abused the most so you need to isolate the risk somehow
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MailChimp works the same way. And you increase in deliverability as your reputation improves.
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A Sparkpost employee was also complaining about this being a problem. Not enough ipv4 addresses to give a dedicated one to each customer.
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