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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 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 ( 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.


QuixTec provides this and other technical bulletins unaltered from Microsoft. As an authorized Microsoft Partner, we ensure that all our solutions we deliver to you include the latest Microsoft updates.

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