Gregory's ServerFor those 1 million domains, we find around 433K distinct MX servers in 230K domains. The top 20 mail server domains there are:
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So all in all, the answer to the question of who can read your email pretty much boils down to -- yep -- "Google and Microsoft". Even if your domain doesn't use one of their mail servers, chances are that whoever you are sending mail _to_ does. Now these companies are probably doing a much better job running and securing your mail than you would, and outsourcing often makes good sense. But still, this is another example of increasing centralization: our businesses and personal online lives are concentrated in the hands of just a few companies. Alright, that's all for today. Gotta go and fix my postfix DMARC setup and block a bunch of spammers or something. And if you don't like social media threads or want to share this outside of Mastodon, here's all of the above in a single blog post: |
Google and Microsoft together handle over 60% of the Top 1M domains' mails!
Many other domains use service provides such as Proofpoint, Barracuda Networks, or Cisco / IronPort, but those may of course only sit in front of Google and Microsoft's mail servers as well.