This guide explains how to ensure that mail is successfully delivered to your users within an Office 365 environment.

1. Configure Advanced Delivery

• As an O365 Security Administrator, navigate to https://security.microsoft.com/advanceddelivery
• Select the Phishing simulation tab and click Edit.

• On the Edit third-party phishing simulation tab, configure the following settings:
  1. Domain: Expand this setting and enter the AWS domain spm.metacompliance.com for your phishing simulations.
     • ⚠️ Please note: The IP address and domain need to be added for Advanced Delivery to function correctly.
  2. Sending IP: Expand this setting and enter the relevant IP addresses. 
     • ⚠️ Please note: The listed IP addresses are dedicated IPs for MetaCompliance, so only emails sent from these will be processed correctly by Advanced Delivery.

When completed, action one of the following steps:

• First time: Select Add, followed by Close.
• Edit existing: Select Save, followed by Close.

After implementing these changes, send a test phish to a small number of users to confirm that allowlisting has been applied successfully.

Further information can be found in the Microsoft article below:

• Configure the Advanced Delivery policy for third-party phishing simulations and email delivery to SecOps mailboxes

2. If you have Safe Links enabled, add 'Do not rewrite URLs in email'.

If Safe Links turned on within Microsoft Defender, you must add our domains to the Do not rewrite URLs in email within URL & click protection settings. 

This can be actioned via the following steps:

• Navigate to your existing Safe Links policy.
• Click URL, followed by Protection Settings.
• Click Manage 0 URLs - see below.
• Select Add URLs.
• Add any domains you will be using in the following format: *.domainname.com/*
• Lastly, click Save and then save your policy.

• This prevents Safe Links from scanning and rewriting URLs that have been added to the Manage 0 URLs section. 

More information can be found in the Microsoft article below:

• Safe Links in Microsoft Defender for Office 365