Mimecast Allowlisting

Updated 2 months ago by Jacob Flinders

To successfully whitelist our phishing and training-related emails when using Mimecast, you should Create a new Permitted Sender policy to allow our phishing and training-related emails through to your users' inboxes.

Important: Do not edit your default Permitted Sender policy. A new one must be created.

To allow a specific static IP address (in this case, 23.249.219.118) through Mimecast, please follow these steps:

  1. Log in to your Mimecast Administration Console using your administrative credentials.
  2. Click on the "Administration" menu located in the top navigation bar, then select "Gateway | Policies" from the dropdown menu.
  3. Under the "Gateway Policies" section, select "IP and Domain Reputation."
  4. Click on the "IP Allow/Deny" tab.
  5. Under "IP Allow/Deny," click on the "Add IP Range" button.
  6. In the "Add IP Range" dialog box, enter the following information:
    • Range name: Enter a name that describes the IP address you're adding (e.g., "Allowed IP").
    • From IP: Enter the static IP address you want to allow (in this case, 23.249.219.118).
    • To IP: Leave this field blank.
    • Comment: Add any additional information or notes about the IP range.
  7. Click the "Add" button to save the IP range.
  8. Once the IP range has been added, you can create a policy to allow or deny traffic from this IP range. To do this, go back to the "Gateway Policies" section and select "Internal Email Protect" or "Permitted Senders."
  9. Click on the "Add Policy" button to create a new policy.
  10. In the "Add Policy" dialog box, configure the policy as follows:
    • Policy type: Select "Allow" to allow traffic from the IP range you added earlier.
    • Senders: Leave this field blank to apply the policy to all senders.
    • Recipients: Leave this field blank to apply the policy to all recipients.
    • IP Ranges: Select the IP range you added earlier.
    • Comment: Add any additional information or notes about the policy.
  11. Click the "Add" button to save the policy.

Congratulations, you have successfully allowed the static IP address 23.249.219.118 through Mimecast. Keep in mind that it may take some time for the changes to take effect. If you have any issues or questions, you can contact Mimecast support for further assistance.

For further information regarding allowlisting in Mimecast, you may wish to see their guides on this shown in the link below:

Web Security- Configuring Block or Allow List Policy (mimecast.com)

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