Accessing the Secure Messaging Portal

Document created by user.oxriBaJeN4 Employee on Sep 7, 2015Last modified by user.oxriBaJeN4 Employee on Apr 10, 2018
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Access to the Secure Messaging Portal is intended for the sole use of the intended recipient. Login details should not be shared with other parties.

This article describes how users can access the Secure Messaging Portal. It applies to:

  • Users who are a Mimecast customer.
  • Users who are not Mimecast customers, but who receive a Secure Message notification.


I am a Mimecast Customer


To access the Secure Messaging Portal:

  1. Open your browser.
  2. Navigate to either the:
    • Secure Messaging Portal URL for the region where your Mimecast account is hosted. See the Mimecast Data Centers and URLs page for further details.
      You must be logged on to Mimecaster Central to access this page.
    • Custom URL provided by your Administrator.
  3. Enter your Primary Email Address.
  4. Click Next.
  5. Select either the Cloud or Domain authentication method from the drop down list. Ask your Administrator which one you should use if you are unsure.
  6. Enter your Password. The Secure Messaging Portal is displayed.


I am not a Mimecast customer


The Secure Messaging Portal allows recipients of a secure message to read it and respond. It requires users to log in with their email address and secure messaging password before any messages can be accessed.


When a secure message is sent to you by a Mimecast user, you'll receive a email notification like the one below.



To access the Secure Messaging Portal:

  1. Click the link in the notification message. The Secure Messaging Portal log in dialog is displayed.
  2. Enter your Email Address.
  3. Click the Next button. The Password field is displayed.
  4. Enter your Secure Messaging Portal Password.
    If this is your first time logging in to the Secure Messaging Portal, see the First Time Users section below. If you already have log in details for the Closed Circuit Messaging (CCM) Portal, these same details will work for the Secure Messaging Portal.
  5. Click the Log In button. The Secure Messaging Portal is displayed.


First Time Users


If this is the first time you have accessed the Secure Messaging Portal, you'll receive a separate email with the log in details required to access the Secure Messaging Portal. This includes the email address to use, and a temporary password. This password must be changed as part of the log in process. This new password can then be used whenever you access the Secure Messaging Portal in the future.



To change your password:

  1. Enter the Password displayed in the second email notification in the top field.

    If you use the “copy and paste” feature to copy across the initial password, check this does not add an extra space at the end of the password. If it does, this will create an error preventing you from logging in.

  2. Enter a New Password in the middle field.
  3. Confirm the New Password in the bottom field.
  4. Ensure the password meets Mimecast's requirements.
  5. Click on the Confirm button. The Secure Messaging Portal is displayed.


See Also...