New blog post: MTA-STS is Hard. Here's how DNS Providers Can Make it Awesome With Automation... https://www.agwa.name/blog/post/mta_sts_automation …
Sure, but if those CNAMEs point at the mail provider, then you still have the problem that changing your MX record requires updating three things. It's better than nothing, but it's still the DNS provider who should be taking care of it.
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Yeah, I think it'd be great if DNS providers did this automatically. But to be clear, with the CNAME solution, migration is only two changes, assuming someone has set up a reverse proxy for your new host. 1/2
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And while we're at it, the reverse proxy doesn't have to be run by your host. Anyone can run a reverse proxy for a popular provider's mta-sts policy. The code is even on github. :) 2/2
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