NOTE: The following method of safelisting has been deprecated as of 09/01/2021. You will want to implement the new Advanced Delivery rules for Microsoft 365 clients. If you implement the new rules and still experience bounced/deferred emails, follow the steps in this article.
Overview
A connector can be used to help deliver emails in high volume campaigns. If you are experiencing deliverability issues in Microsoft 365, you may need to configure a connector. This step can help bypass graylisting, which Microsoft has implemented on PhishingBox simulated phishing emails (for more information on graylisting, see article: Fix email delivery issues for error code 451 4.7.500-699 (ASxxx) in Exchange Online).
Create a Connector
Follow the steps below to configure a connector in Microsoft 365:
- Navigate to admin.exchange.microsoft.com.
- Expand Mail Flow and click "Connectors.
- Click the 'Add a connector' button to start the New Connector wizard.
- Connection from: Partner Organization.
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Connection to: Office 365
- Click "Next".
- Name: Enter a descriptive name for the connector, such as 'PhishingBox Connector'. Adding a connector description is optional.
- Ensure the Turn it on checkbox is checked.
- Click "Next".
- Click the 'By verifying that the IP address...' radio button.
- Add all necessary IP addresses. PhishingBox mail server IP addresses are below:
US - Phishing and Training Mail: 64.191.166.196, 64.191.166.197
US - System Mail: 69.72.47.194
EU - Phishing and Training Mail: 64.238.34.10, 64.238.34.11, 64.191.166.197
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EU - System Mail: 161.38.205.202
- Click "Next".
- Ensure the 'Reject email messages if they aren't sent over TLS' checkbox is checked.
- Click "Next" to navigate to the last step.
- On the final page, review the connector's settings and click Create connector to enable the connector.