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Microsoft 365 Changelog

M365 Changelog: (Updated) Suspicious Connector Activity Alert

Rabia Noureen


MC365410 – Updated August 9, 2022: Microsoft has updated the rollout timeline below. Thank you for your patience.

As a security platform, Microsoft strives to continuously improve and protect our customers. In May, Microsoft plans 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:

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

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, Microsoft 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.

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