Moving subdomains to separate zones can make sense for a small set of subdomains and all your certificates would be for names under those subdomains. It gets unwieldy if you have to create a separate zone for each certificate because the certificates don't share a subdomain. But this can be a solution in some circumstances. Thanks.

I see that AWS permissions can be set to limit the risk of compromised credentials. That's a good idea. I see that the lego project has an example of this in their documentation: https://go-acme.github.io/lego/dns/route53/index.html#least-...

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