ASD's Blueprint for Secure Cloud

Mail Exchange Records

This section describes the design decisions associated with Microsoft 365 Mail Exchange Records for system(s) built using ASD's Blueprint for Secure Cloud.

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Mail Exchange (MX) records specify the mail server responsible for accepting mail on behalf of the domain. The record is a resource in the Domain Name System (DNS), and it is possible for a single domain to have multiple MX records. Multiple records are largely configured for availability, redundancy, and load balancing reasons.

Cloud native deployments

Hybrid deployments

Security & Governance

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Do you have a suggestion on how the above page could be improved? Get in touch! ASD's Blueprint for Secure Cloud is an open source project, and we would love to get your input. Submit an issue on our GitHub, or send us an email at

Acknowledgement of Country icon

Acknowledgement of Country
We acknowledge the Traditional Owners and Custodians of Country throughout Australia and their continuing connections to land, sea and communities. We pay our respects to them, their cultures and their Elders; past, present and emerging. We also recognise Australia's First Peoples' enduring contribution to Australia's national security.

Authorised by the Australian Government, Canberra