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Office 365 Message Encryption

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Office 365 Message Encryption

OME is Microsoft's email encryption service — what it does, how to enable it, and what it looks like for recipients.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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01

How OME works

When a user encrypts a message:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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Sender-side controls

Senders can apply OME in several ways:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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Admin-applied OME via transport rules

For consistent enforcement, admins set up transport rules that automatically encrypt messages matching conditions:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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What recipients see

External recipients receive an email with a link to the secure portal:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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Branding

OME supports custom branding — your organisation's logo and colours in the portal, customised wording in the notification email. Set up in the Microsoft 365 admin center.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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Licensing

OME is included with Microsoft 365 E3, E5, Business Premium, Microsoft 365 Apps for Enterprise, and Office 365 E3 / E5. Recipients don't need any Microsoft licence — the portal handles them with whatever they have.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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When OME is the right tool

For internal-only sensitive content, sensitivity labels with Encrypt-Only are usually enough without going through OME's external-recipient flow.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/office-365-message-encryption

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