Naively I thought that one value proposition of SPF, DKIM and DMARC is that reputation shifts from based on IP to be based on domain, once you set these up correctly. So as long as you can maintain a good reputation for your domain and have SPF, DKIM and DMARC correctly set up, then you can host your SMTP server at any IP and your emails will get delivered.
I wonder why it doesn't work this way.
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