Anti-Spoofing in Mimecast

This article will guide you or your technical team through bypassing this Mimecast policy.

Written by Marisa Crowder
October 23, 2024

Follow these steps to learn how to bypass this Mimecast policy:

• Log in to your Mimecast administration console.
• Select Administration, then select Gateway, then Policies.
• Scroll down and select Anti-Spoofing.

Options

• Click New Policy.
• In the Policy Narrative field, type Nectar IP Permit. (Or whatever will help track this policy.)
• In the Select Option field, select Take No Action.

Emails From

• In the Addresses Based On field, select Both.
• In the Applies From field, select Everyone.
• In the Specifically field, select Applies to all Senders.

Emails To

• In the Applies To field, select Everyone.
• In the Specifically field, select Applies to all Recipients.

Validity

• In the Enable/Disable field, select Enable.

• In the Set Policy as Perpetual field, ensure the policy is set to Always On.

• In the Policy Override field, check the box.

• This overrides the default order that policies are applied. If there are multiple applicable policies, this policy is applied first unless more specific policies of the same type are configured with an override.

• In the Source IP Ranges, input Nectar's delivery server IP address:

• 159.183.82.50

• Select Save and Exit.

Congrats! You've configured Mimecast to allow emails sent by Nectar to bypass Anti-Spoofing!