ASD's Blueprint for Secure Cloud

Accepted Domains

This section describes the design decisions associated with Accepted Domains for system(s) built using ASD's Blueprint for Secure Cloud.

Estimated reading time: 2 minutes

Accepted Domains are SMTP namespaces configured within Exchange Online. Only emails addressed to users within the nominated domains are accepted.

Accepted Domains consist of the following types:

  • Authoritative Domains - Authoritative Domains are domains where the Exchange Organisation accepts messages addressed to recipients and is responsible for generating non-delivery reports. On creation of an Exchange Online organisation the tenant domain Fully Qualified Domain Name (FQDN) and the <tenantname>.mail.onmicrosoft.com FQDN are automatically populated as an Authoritative Domains; and
  • Relay Domains - Relay Domains are often called Non-Authoritative Domains. The Exchange Organisation will accept the messages addressed to the recipients; however, it is not responsible for generating non-delivery reports. Hybrid Exchange leverages Relay Domains and mail connectors to relay messages between both on-premises infrastructure and Exchange Online.

Hybrid deployments

Security & Governance

  • None identified

Design

References

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 blueprint@asd.gov.au

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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