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Written by Brad

Categories: Exchange Online

July 28, 2022

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(Updated) Suspicious Connector Activity Alert

Exchange Online, Microsoft 365 Experts

From Microsoft Corporation
Technical Bulletin: MC365410 · Published Apr 29, 2022 · Last updated Jul 7, 2022

Message Summary

Updated July 7, 2022: We have updated the rollout timeline below. Thank you for your patience.

As a security platform, we strive to continuously improve and protect our customers. In May, we plan to start rolling out a new alert for suspicious activities in an inbound connector. For information on connectors, please visit Configure mail flow using connectors in Exchange Online | Microsoft Docs.

When this will happen:

We will begin rolling out in late May and expect to complete by late July (previously late June).

How this affects your organization:

When suspicious activity (for example: compromise) is detected, relayed mails will be blocked from the inbound connector, and the administrator will receive an email notification and an alert under https://security.microsoft.com/alerts. This alert will provide guidance on how to investigate, revert changes and unblock a restricted connector. To learn how to respond to this alert, please visit: Responding to a Compromised Connector.

Additionally, we will introduce some new changes in the existing Restricted users page (https://security.microsoft.com/restrictedusers) in order to support this improvement. The changes are the following:

Current Experience

Restricted users current view
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Future Experience
Restricted entities current view
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What you can do to prepare:

Impacted customers are recommended to become familiar with the following instructions before rollout happens.

TECHNICAL BULLETIN END

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