To send a secure email in Outlook, you can use built-in encryption features such as S/MIME or Microsoft Purview Message Encryption. Here are the main steps:

Sending an Encrypted Email in Outlook

1. Compose a New Email
   Open Outlook and start a new email message.

2. Select Encryption Options
   Go to the Options tab in the email window and click Encrypt. You will see options like:

   • Encrypt (encrypts the email content and attachments)
   • Do Not Forward (encrypts and restricts forwarding)
     Choose the option that fits your needs.

3. Send the Email
   Finish composing your message and click Send. The email will be encrypted, preventing unauthorized access

Setting Up S/MIME Encryption (Optional for Enhanced Security)

• Obtain an S/MIME certificate from a trusted Certificate Authority (e.g., Comodo, GlobalSign).
• Import the certificate into Outlook via File > Options > Trust Center > Trust Center Settings > Email Security > Import/Export.
• Share your digital certificate by sending digitally signed emails to your contacts.
• Once set up, you can encrypt all outgoing emails by default in Trust Center Settings or encrypt individual messages

How Recipients Access Encrypted Emails

• Recipients may need to verify their identity, often via a one-time passcode sent to their email.
• After verification, they can read the encrypted message securely.
• Some encryption methods allow recipients to reply securely without additional setup

Additional Notes

• Your Outlook account must have a qualifying Microsoft 365 subscription to use these encryption features.
• Encryption prevents unauthorized access by converting your email into scrambled text readable only by the intended recipient.
• Digital signatures can also be added to verify sender identity and ensure message integrity

This process ensures your emails and attachments are protected during transmission and only accessible to authorized recipients.