Email Encryption Using Office 365

How to Send an Encrypted Email in Microsoft 365

Use email encryption when sending confidential or sensitive information. Encryption ensures only the intended recipient can read your message.

Encrypt an Email in Outlook (Desktop)

Steps

  1. Open Outlook

  2. Click New Email

  3. Write your email

  4. Click Options at the top

  5. Select Encrypt

  6. Choose one:

    • Encrypt – Protects the message

    • Do Not Forward – Prevents forwarding, copying, or printing

  7. Click Send

✅ Your message is now encrypted

Encrypt an Email in Outlook on the Web (Browser)

Steps

  1. Go to https://outlook.office.com

  2. Click New message

  3. Write your email

  4. Click More options (⋯) at the bottom

  5. Select Encrypt

  6. Choose:

    • Encrypt

    • Do Not Forward

  7. Click Send

What the Recipient Sees

Recipient Using Microsoft 365

  • Email opens normally

  • No extra steps required

External Recipient (Non-Microsoft 365)

Steps for External Recipients

  1. Open the email

  2. Click Read the message

  3. Receive a one-time passcode by email

  4. Enter the passcode to read the message securely

🔒 Attachments are encrypted automatically

Helpful Tips

  • Use Do Not Forward for HR, legal, or financial information

  • Avoid sending passwords and usernames in the same email

  • Encrypted emails may not preview in mobile notifications

  • Replies to encrypted emails are encrypted automatically

Frequently Asked Questions

How can I tell my email is encrypted?
You will see Encrypt or Do Not Forward selected before sending.

Can I encrypt attachments?
Yes. Attachments are encrypted with the email automatically.

Can recipients reply?
Yes. Replies remain encrypted.

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