Nice data: stats.dnssec-tools.org Nearly 2M domains with DNSSEC and MX pointing to host with DANE records. But under 5500 actual MX's with DANE records. IOW almost everyone's mail is outsourced to big providers...
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I have attestation.app set up to send out the automated alert emails that are part of the service with OpenSMTPD + dkimproxy but I simply haven't had time to do more. Forwarding emails sent to the GrapheneOS domains is a placeholder until there's time to set something up.
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It's not currently supported by OpenSMTPD which is the current mail server:
github.com/OpenSMTPD/Open
I don't know what happened with their work on implementing it. To have DANE verification in the short term I'd need to use a different mail server, which isn't very appealing.
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Uhg, looks like it's been pending since 2014:
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I ended up migrating to Postfix to get DANE verification for my outbound mail along with the potential to start checking MTA-STS policies via github.com/Snawoot/postfi if I decide to integrate that. Also switched to OpenDKIM from dkimproxy and added in spf-engine to verify SPF.
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If I run the mail server on another server to share it across attestation.app and grapheneos.org, AttestationServer would have a remote connection via SMTPS:
github.com/GrapheneOS/Att
I'd probably need to deal with TLS at a lower level to pin a certificate there.
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What SMTPS even means is fuzzy, but AIUI it's just a convention for mail submission and has nothing to do with transport.
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