Overview
All Office 365 emails, whether sent via the Outlook web client or Outlook desktop client, are encrypted by default using Transport Layer Security (TLS). This encryption ensures that emails remain secure from the moment they are sent until they are received by the intended recipient. This does not protect the content of the email, however, once it reaches the recipient.
Additional Email/File Encryption for Enhanced Security
For added security, users can encrypt files before attaching them to an email, and they can also encrypt the email itself. This provides an extra layer of protection, particularly for sensitive information. However, since the recipient needs a password to decrypt the files, it is recommended to follow these best practices:
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Use a Strong Encryption Tool:
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7-Zip is recommended for encrypting files.
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When compressing a file, choose the option to add a password for decryption.
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Send the Password Separately:
By following these steps, you ensure that even if an email is intercepted, the file remains secure and accessible only to the intended recipient.