Outlook Add-in Documentation

Key Features

Email Encryption

One-click encryption for sensitive emails

Read Receipts

Track when messages are opened

Message Expiration

Set automatic expiry dates

Secure Attachments

Protected file encryption

How to Install CypherMail

Installing the Add-in

1. Open Outlook

Launch Outlook on your desktop or open Outlook Web Access (OWA) in your browser

2. Access the Add-ins Menu

For Outlook Desktop:

  • Go to the Home tab
  • Click on Get Add-ins in the ribbon (or Store in some versions)

For Outlook Web Access:

  • While composing a new message, click the ... (more options) button
  • Select Get Add-ins
3. Find CypherMail

In the Office Add-ins store:

  • Search for "CypherMail" in the search box


4. Add to Outlook

Click the Add or Get it now button

If prompted, confirm that you want to install the add-in

5. Admin Installation (for Organizations)

For IT Administrators deploying to multiple users:

  • Access the Microsoft 365 Admin Center
  • Navigate to Settings > Integrated apps
  • Click Get apps
  • Search for "CypherMail" and deploy to your organization

How to Use CypherMail

First-Time Experience

When you first launch the add-in, you'll see a welcome screen that introduces the key features. Click the "Get Started" button to proceed to the main interface.

Using CypherMail to Encrypt Messages

1. Access the Add-in

When composing a new email in Outlook, click the "CypherMail" button in the ribbon menu

2. Configure Encryption Options

In the taskpane that appears, you'll see the following options:



  • Encrypt Message: Toggle this on to enable encryption
  • Notify when read: Get notified when your recipient opens the message (only available when encryption is enabled)
  • Expires after: Set an expiration time for your message from options ranging from 24 hours to 30 days (only available when encryption is enabled)
3. Send Your Message

After configuring your settings, compose your email as normal

When you send the message, it will be encrypted according to your selected options

Important Notes

  • The encryption options (read receipts and expiration) are only available when the main "Encrypt Message" toggle is enabled
  • When you've successfully applied encryption, you'll see a notification confirming that your message will be sent securely
  • Your encryption preferences are applied to the current message only