Mimecast cloud application

You must be signed in as a super administrator for this task.

With Security Assertion Markup Language (SAML), your users can sign in to enterprise cloud applications with their Google Cloud credentials.

Set up SSO via SAML for Mimecast cloud

Before configuring SSO, you need to know which Mimecast grid hosts your organization’s Mimecast account. Then, based on its location, choose a region from the following list:

  • Europe: EU
  • United States: US
  • South Africa: ZA
  • Australia: AU
  • Offshore: JER

For step 1, you also need the account code unique to your Mimecast account. To see your account code, go to Administration and then Account and then Account Settings on Mimecast’s Administration Console.

Step 1: Set up Google as a SAML identity provider (IdP)
  1. Sign in to your Google Admin console.

    Sign in using an account with super administrator privileges (does not end in @gmail.com).

  2. In the Admin console, go to Menu ""and then"" Appsand thenWeb and mobile apps.
  3. Click Add appand thenSearch for apps.
  4. Enter Mimecast in the search field.
  5. In the search results, hover over the Mimecast SAML app and click Select.
  6. On the Google Identity Provider details page:
    1. Copy and save the SSO URL.
    2. Copy and save the Entity ID.
    3. Download the Certificate.
  7. Click Continue.
  8. On the Service provider details page, edit the ACS URL and the Entity ID values. Replace {region} and {account code} with the values appropriate for your Mimecast account.
  9. Click Continue.
  10. (Optional) On the Attribute Mapping page, map Google directory attributes to corresponding application attributes:
    1. Click Add Mapping.
    2. Click the Select field menu and select a Google directory attribute.
    3. Enter the corresponding application attribute under App attributes.
  11. (Optional) If you want to send a user’s group membership information in the SAML response, enter the group names that are relevant for this app in the Group membership field.
    1. Under Google groups, click in the Search for a group entry field.
    2. Type one or more letters of the group name.
    3. Choose the group name from the list.
    4. Add additional groups as needed (total groups cannot exceed 75).
    5. Under App attribute, enter the service provider’s corresponding groups attribute name.

    Note: Regardless of how many group names you enter, the SAML response will only include groups that a user is a member of (directly or indirectly). For more information, see About group membership mapping.

  12. On the Attribute mapping page, click Finish.
Step 2: Set up Mimecast as a SAML 2.0 service provider (SP)
  1. Open a new incognito browser window and sign in to the Administration Console of your Mimecast account.

  2. Go to Administration and then Services and then Applications.

  3. Click Authentication Profiles.

  4. Do one of the following:

    • Select an existing Authentication Profile to update.

    • Click New Authentication Profile to create a new one. Then enter a description.

  5. Click Enforce SAML Authentication for Mimecast Personal Portal.
    The screen displays the SAML settings.

  6. Do one of the following:

    • Select Google from the Provider pull-down list to see help text specific to Google

    • Select Other if you don’t find Google in the list.

  7. Enter the Google IdP’s SSO URL (you copied in step 1) in to the Login URL field.

  8. Enter the Google IdP’s Entity ID (you copied in step 1) in to the Issuer field.

  9. Copy and paste the content of the Google IdP Certificate (you downloaded in step 1) in to the Identity Provider Certificate Metadata field. Delete the Begin and End tags from the Certificate.

  10. Click Allow Single Sign On.
    This setting enables (or disables) Identity Provider initiated Sign On.

Step 3: Enable the Mimecast app
  1. Sign in to your Google Admin console.

    Sign in using an account with super administrator privileges (does not end in @gmail.com).

  2. In the Admin console, go to Menu ""and then"" Appsand thenWeb and mobile apps.
  3. Select Mimecast.
  4. Click User access.
  5. To turn a service on or off for everyone in your organization, click On for everyone or Off for everyone, and then click Save.

  6. (Optional) To turn a service on or off for an organizational unit:
    1. At the left, select the organizational unit.
    2. To change the Service status, select On or Off.
    3. Choose one:
      • If the Service status is set to Inherited and you want to keep the updated setting, even if the parent setting changes, click Override.
      • If the Service status is set to Overridden, either click Inherit to revert to the same setting as its parent, or click Save to keep the new setting, even if the parent setting changes.
        Note: Learn more about organizational structure.
  7. (Optional) Turn on the service for a group of users.
    Use access groups to turn on a service for specific users within or across your organizational units. Learn more

  8. Ensure that your Mimecast user account email IDs match those in your Google domain.
Step 4: Verify that SSO is working

Mimecast supports both Identity Provider (IdP) initiated and Service Provider (SP) initiated SSO. Follow these steps to verify SSO in either mode:


  1. Sign in to your Google Admin console.

    Sign in using an account with super administrator privileges (does not end in @gmail.com).

  2. In the Admin console, go to Menu ""and then"" Appsand thenWeb and mobile apps.
  3. Select Mimecast.
  4. At the top left, click Test SAML login

    Mimecast should open in a separate tab. If it doesn’t, use the information in the resulting SAML error messages to update your IdP and SP settings as needed, then retest SAML login.


  1. In a new incognito browser window, go to the Mimecast Personal Portal.  
  2. Enter your primary email address.
    You should be automatically redirected to the Google sign-in page.
  3. Enter your username and password. 
    After your credentials are authenticated you are automatically redirected to Mimecast.

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