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Here you can find a useful site on DMARC data providers, sorted on size. The one big ESP missing from the list is Microsoft. Hotmail / Outlook.com used to send aggregate reports, but has stopped ever since the back end got migrated to Office 365. Here you can find a good thread on how ridiculous this actually is...


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When you're using Office 365 to send out emails, basically, Microsoft determines which IP address it'll use. The SPF record for protection.outlook.com authorizes 491,520 individual IPv4 addresses. I think you're right about the volume for your domain. I ran your domain name through Cisco's Talos Intelligence and it returns no volume for the past 30 days. As ...


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There is absolutely no need for a mail server to be on the same machine, in the same building, or even located in the same country as the web server. In your DNS records you will see MX records, which will indicate the hostname of your mail server. Typically, most people would set this as a sub of their own domain (i.e. mail.example.com) and create an A ...


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