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How to whitelist email in Mimecast

  • 30 July 2018
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How to whitelist email in Mimecast
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How to whitelist email in Mimecast

If you are having problems with Security Awareness Training email messages bouncing (not delivering) in Mimecast, please follow the steps below to add the sending email servers to the whitelist.

When using Mimecast, you will need to create a new Permitted Sender policy.

Note: Make sure you do not edit the existing default policy.

To whitelist the Webroot’s Security Awareness Training mail servers, follow these instructions:

1. Log in to the Administration Console.
2. From the menu, select Administration.
3. Select Gateway > Policies.
4. Click the New Policy button.
5. Under Options, name your policy.
6. From the drop-down menu, select Permit Sender.
7. Under Emails From, select the following:
  • Addresses Based On – Both
  • Applies From – Everyone
  • Specifically – Applies to all Senders
8. Under Emails To, select the following:
  • Applies To – Everyone
  • Specifically – Applies to all Recipients
9. Under Validity, select the following:
  • Enable, Set policy as perpetual – Always On
  • The Policy Override checkbox.
10. For Source IP Ranges, enter the Securecast gateway IP:
  • 167.89.85.54


11. Save the policy. This new policy may take up to 30 minutes to take effect.

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