Security News > 2021 > May > Microsoft: Office 365 is blocking emails from Google, LinkedIn domains
Microsoft is working on addressing an Office 365 issue that has resulted in legitimate emails sent from multiple domains getting tagged as malicious and quarantined.
"Users having multiple issues related to email flow, links within email messages and the Microsoft Defender portal," Microsoft says in the Microsoft 365 admin center.
Microsoft says the issue stems from an accidental block placed on valid and healthy domains, which resulted in legitimated emails inadvertently being quarantined.
"We're working to release the email messages that were quarantined, as well as investigating options to restore the health of the Microsoft Defender portal."
Update 1: Microsoft has fixed the bug that led to legitimate emails getting quarantine and is working on releasing messages already quarantined by mistake.
Update 2: Microsoft processed all mistakenly quarantined emails and is now unblocking users still unable to send new messages.
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