IronSights

Microsoft 365 & cloud

Exchange Online

Microsoft's cloud-hosted email and calendar service included in Microsoft 365, providing managed email infrastructure with built-in spam filtering, archiving, and integration with the broader security stack.

Also known asExchange Online emailMicrosoft Exchange Online

In plain English

Exchange Online is the email service behind every Microsoft 365 mailbox. Security controls including DMARC, DKIM, SPF, Defender for Office 365 Safe Links and Safe Attachments, DLP policies, and legal hold all operate at the Exchange Online layer — making it the primary surface for both attack and defence in most Australian organisations.

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More terms in the IronSights Glossary.