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Office 365 OWA

This page provides an overview of the Secure Messaging Office 365 Outlook Web Access (OWA) add-in, including quick facts, instructions on how to install and activate the add-in, and how to use it.


The Secure Messaging Office 365 OWA app lets you transform Outlook in Office 365 into a powerful, secure communications platform. With Secure Messaging integrated into Office 365 OWA, you can encrypt emails, manage your secure messages alongside basic email messages, securely provision e-signatures, share large files, and mount e-campaigns right from OWA using existing accounts.

Integration is simple without requiring any additional training or complicated provisioning, which ensures rapid adoption. Because there are no encryption keys to manage, your users can easily communicate securely with both internal and external recipients seamlessly. There is no better solution for securing your communications in Office 365 than Secure Messaging.


Quick Facts

  • Secure messages are sent through your organization’s branded Secure Messaging platform to ensure encrypted delivery of all content.
  • Designed to be a lightweight add-in to OWA that can be set up by individual users or an administrator.
  • Because there is no new software to learn and it’s so simple to use, the solution will actually be supported and adopted by staff and external recipients, ensuring the encryption of your sensitive data.
  • Email content and file attachments can be stored decrypted in the mail server (e.g. Exchange) both by the sender and the external recipients without integration at the mail server level.
  • Eliminates the need for recipients to login to a separate portal that  is only available through a web browser.
  • Gives users the option to quickly choose between creating a new secure or basic email message.
  • The Delivery Slip is added to the right side of the compose window and gives you access to all of Secure Messaging’s powerful features.
  • Instantly and securely send, receive, and track attachments and e-signature documents without taxing the mail server.
  • It works with all mail servers and all existing email archiving, compliance, e-discovery, and DLP set-ups.
  • No server changes are required, making it a true cloud solution.


Installing the Secure Messaging Office 365 OWA Add-in

      1. Go to and log in to your Secure Messaging account.
      2. From the left navigation panel, click any of the app icons.
      3. Click the Windows icon. Under Microsoft Office 365 Web App (OWA) Add-in, click Install now… and then follow the onscreen instructions.

Installing the Office 365 Add-in


Using the Secure MessagingOffice 365 OWA Add-in

      1. Once the add-in is installed, to open a secure message directly in OWA, click Secure Email.
      2. Once you click that, a Secure Messaging inset window will open.
      3. Use the inset scroll bar to access all of the Delivery Slip functions.
      4. To view the rest of your secure messages, click SECURE MESSAGES.
      5. Note: Do not use the default Outlook “Reply/Reply all” button to respond to a secure message.
Secure Messaging Office 365 Add-in - One
Secure Messaging Office 365 Add-in - Two


Last edited September 23, 2016


Does this work with Google, Office365 or Outlook?

Yes. DeliverySlip works equally well with Gmail/G Suite, Microsoft 365 and Outlook.

Do I need a new Email Account? Will there be Secondary passwords, PINS & keys to manage?

No, keep using your existing email address or aliases. Your email client and server infrastructure also remain the same. DeliverySlip works seamlessly from your inbox by using our Secure MS Outlook Toolbar or Chrome extension. There are no secondary passwords, PINS or keys required.

Where is the data stored when the email is sent securely?

Secure message content is stored encrypted at rest, using AES 256 bit encryption. Your encrypted data is stored in Microsoft Azure's cloud in the data jurisdiction that you selected (either USA, UK, Canada or Australia) upon your registration.

Do your support SSO (Single Sign On)?

DeliverySlip supports Azure Active Directory, Okta, Google, and others.

Does DeliverySlip work on mobile phones? Will I be able to read secure emails on a mobile phone?

Yes, DeliverySlip works on mobile phones and you will be able to read and reply to secure messages. Apps are available for iOS and Android devices.

Can email be automatically encrypted or must we manually encrypt it?

Yes. With data-leak prevention (DLP) rules enabled, DeliverySlip automatically encrypts information like Social Security, credit card or account numbers and keywords that can be tailored to your organization.

What regulatory compliance schemas do you support?

DeliverySlip is suitable for use with organizations that are subject to any number of regulatory compliance schemas including; GDPR, SOX, GBLA, FINRA and more.

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