MC1048624 | (Updated) DNS Provisioning Change

Service

Exchange Online

Last Updated

2026-02-02T21:52:05.96Z

Published

2025-04-04T23:12:38Z

Message ID

MC1048624

Updated February 2, 2026: We have updated the timeline. Thank you for your patience. We’re making some changes to DNS provisioning of A records for all new Accepted Domains provisioned after July 1st, 2026 (previously February 1st). Between early and late July 2026 (previously February), we will gradually switch provisioning of all A records for new Accepted Domains into the new subdomains under mx.microsoft. We are doing this to reduce the friction of adopting DNSSEC in the long run. DNSSEC is a set of extensions to DNS that provides cryptographic verification of DNS records, preventing DNS spoofing and adversary-in-the-middle attacks to DNS. [How this will affect your organization:] After...

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