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Enhance Security with Native External Sender Callouts in Outlook

Native External Sender Callouts on Email in Outlook
What are Native External Sender Callouts?
Native external sender callouts, also known as external sender callouts (ESC), are a feature of Exchange Online that provides an additional layer of security for incoming emails. This feature will allow Exchange Online to query a third-party service, such as a DNSBL, to check if a sender is legitimate or not. If the sender is not legitimate, Exchange Online will reject the message.

Why Use Native External Sender Callouts?
Organizations are vulnerable to phishing attacks and other malicious emails. By using native external sender callouts, organizations can increase the security of their email system and reduce the chances of malicious emails being delivered. This is especially important for organizations that receive a large amount of email from external sources.

How to Enable Native External Sender Callouts
Enabling native external sender callouts is a simple process. The first step is to create a connector in Exchange Online. This connector will be used to query the external service.

The next step is to configure the connector. This involves setting the connector to use a specific DNSBL service, as well as specifying which domains should be queried. The domains should be those domains that are most likely to send emails to the organization.

Finally, the connector must be enabled. This can be done in the Exchange Online admin center.

Conclusion
Native external sender callouts are a powerful and necessary tool for organizations that receive a large amount of email from external sources. They provide an additional layer of security and can help to reduce the chances of malicious emails being delivered.

Enabling native external sender callouts is a simple process, and it can be done in a few steps. It is important to configure the connector properly, as this will ensure that only legitimate emails are accepted. Once the connector is configured and enabled, organizations can rest assured that their email system is secure.
References:
Native external sender callouts on email in Outlook

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