According to their documentation, DNSSEC/DANE for outbound SMTP is already GA but DNSSEC/DANE for inbound SMTP is scheduled for July 2023.
Microsoft 365 Roadmap | Microsoft 365
Microsoft is committed to providing world-class email security solutions and the support for the latest Internet standards in order to provide advanced email protection for our customers. With this change we are adding outbound Support for DNSSEC/DANE for SMTP to Exchange Online. Look for another roadmap item which covers inbound mail. - Feature ID: 63212
- Added to roadmap: 4/6/2020
- Last modified: 5/31/2022
- Product(s): Exchange
- Cloud instance(s): GCC, Worldwide (Standard Multi-Tenant)
- Release phase(s): General Availability
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Microsoft is committed to providing world-class email security solutions and the support for the latest Internet standards in order to provide advanced email protection for our customers. With this change we are adding inbound support for DNSSEC/DANE for SMTP to Exchange Online. Look for another roadmap item which covers outbound mail. - Feature ID: 63213
- Added to roadmap: 4/6/2020
- Last modified: 4/5/2022
- Product(s): Exchange
- Cloud instance(s): GCC High, DoD, GCC, Worldwide (Standard Multi-Tenant)
- Release phase(s): General Availability
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