{"id":15925,"date":"2026-02-12T07:05:09","date_gmt":"2026-02-12T06:05:09","guid":{"rendered":"https:\/\/coreit.se\/okategoriserad\/how-does-email-encryption-work-in-microsoft-365"},"modified":"2026-03-26T07:15:29","modified_gmt":"2026-03-26T06:15:29","slug":"how-does-email-encryption-work-in-microsoft-365","status":"publish","type":"post","link":"https:\/\/coreit.se\/en\/faq\/how-does-email-encryption-work-in-microsoft-365","title":{"rendered":"How does email encryption work in Microsoft 365?"},"content":{"rendered":"\n
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How does email encryption work in Microsoft 365?<\/h2>\n\n
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Email encryption in Microsoft 365 protects messages in transit and at rest by ensuring that only the intended recipient can read the content. The service uses standards such as S\/MIME and Office 365 Message Encryption (OME) combined with authentication and policies to prevent unauthorized access, protect sensitive information, and support compliance with regulatory requirements. <\/p>\n <\/div>\n\n

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Background and overview<\/h2>\n

Email is often a target for cyberattacks. Microsoft 365 offers encryption solutions that ensure messages remain confidential, even if they pass through external networks. <\/p>\n\n

Office 365 Message Encryption (OME)<\/h3>\n

OME enables the encryption of emails directly in Microsoft 365, allowing the recipient to read the message through a secure portal with authentication.<\/p>\n\n

S\/MIME encryption<\/h3>\n

S\/MIME uses digital certificates to encrypt and sign emails, ensuring both privacy and sender authenticity.<\/p>\n\n

Automatic encryption policies<\/h3>\n

Administrators can create rules that automatically encrypt emails based on content, recipients or sensitivity level.<\/p>\n\n

Digital signing<\/h3>\n

Digital signatures verify that the message really comes from the sender and that it has not been tampered with during transmission.<\/p>\n\n

Protection against unauthorized access<\/h3>\n

Encryption ensures that only authorized recipients with proper authentication can read the message.<\/p>\n\n

Compliance and reporting<\/h3>\n

Encrypted emails are logged and can be monitored to meet regulatory requirements, such as GDPR, and internal security policies.<\/p>\n\n

Integration with other security services<\/h3>\n

Email encryption works with DLP, ATP and Microsoft Purview to provide comprehensive protection against data leaks and attacks.<\/p>\n <\/div>\n\n

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Key aspects of email encryption<\/h2>\n
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  • OME:<\/strong> Encryption via Microsoft 365 with secure portal for recipients.<\/li>\n
  • S\/MIME:<\/strong> Certificate-based encryption and digital signing.<\/li>\n
  • Automatic policies:<\/strong> Encryption based on content, recipient or sensitivity level.<\/li>\n
  • Digital signature:<\/strong> ensures the authenticity of the sender and the integrity of the message.<\/li>\n
  • Access control:<\/strong> Only authorized recipients can read the message.<\/li>\n
  • Integration:<\/strong> Works with DLP, ATP and Purview for comprehensive protection.<\/li>\n <\/ul>\n <\/div>\n\n
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    Related questions<\/h2>\n\n
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    What is Office 365 Message Encryption (OME)?<\/h3>\n

    An encryption service that protects emails and requires authentication to read them.<\/p>\n <\/div>\n\n

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    How does S\/MIME work in Microsoft 365?<\/h3>\n

    S\/MIME uses digital certificates to encrypt emails and verify the identity of the sender.<\/p>\n <\/div>\n\n

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    Can emails be encrypted automatically?<\/h3>\n

    Yes, administrators can create policies that encrypt messages based on content or recipients.<\/p>\n <\/div>\n\n

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    How does digital signing ensure email security?<\/h3>\n

    It verifies that the message is authentic and has not been modified during transmission.<\/p>\n <\/div>\n\n

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    Can encryption support GDPR compliance?<\/h3>\n

    Yes, encryption protects personal data and enables compliance with data protection rules.<\/p>\n <\/div>\n\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n