How to send/receive encrypted email from Microsoft Outlook

Guide has been updated for Outlook for Office 365/Outlook 2019

Introduction

This guide will help you with configuring Outlook to send encrypted e-mail using S/MIME.

For the purposes of this guide, an external user is someone who has their email hosted outside the domain and control of the Hermes Secure Email Gateway. For example, an external user would have their email hosted with an email service like Gmail, yahoo etc. Typically, this external user has the need to send/receive encrypted email with an internal user i.e. someone who is inside the domain and consequently the control of the Hermes Secure Email Gateway.

Assumptions

This guide assumes you have already received an email with an attached .pfx file. A .pfx file is nothing more than a password protected certificate that you have to install into your Outlook email client. In order to install the certificate, you must have the password which should had been given to you separately.

Instructions

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On the More choices list of certificates, select the certificate with your e-mail address, ensuring the Valid From field has an end date in the future and then click on the OK button (Figure 15). It's possible you have more than one certificate installed in your machine, so you must ensure you select the correct certificate. If you are unsure, ask your for help with your IT department.

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Next, back in the Trust Center window, click the OK button to return back to Outlook (Figure 17).

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Revision #7
Created 21 November 2020 10:18:58 by Dino Edwards
Updated 7 May 2021 12:39:05 by Dino Edwards