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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But that's still over 5000 sites that client DANE validation can be tested against.
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You inspired me to finish the initial mail server setup for these domains:
attestation.app
grapheneos.org
seamlessupdate.app
Until github.com/OpenSMTPD/Open is resolved or I switch to something else, there's no DANE verification for outbound mail though.