ASD's Blueprint for Secure Cloud

Safe Attachments

This section describes the design decisions associated with Safe Attachments Microsoft 365 security features for system(s) built using ASD's Blueprint for Secure Cloud.

Estimated reading time: 2 minutes

The Safe Attachments feature checks email attachments after the email is received but before it is delivered to the user mailbox.

When an Safe Attachments policy is in place and an end-user who is covered by that policy views their email in Office 365, their email attachments are checked, and appropriate actions are taken, based on the configured policies.

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