Exchange Online Protection Restricts Tenants from Sending Unprovisioned Email

Exchange Online Protection monitors outbound email to pick up signs of potential compromise in Office 365 tenants. This can lead to EOP restricting a tenant’s ability to send outbound email and force the administrators to check for compromised accounts or connectors and other problems before contacting Microsoft Support to ask them to lift the restriction.

When Exchange Online Protection Blocks Email Senders

Exchange Online Protection monitors email traffic in and out of Office 365 tenants. When a mailbox exceeds limits, it might end up being restricted, such as in the case when the mailbox might be compromised. We tried to find out when Exchange Online Protection restricted mailboxes and what to do afterwards. Here’s what we discovered.

Office 365 Won’t Block Old Clients But End in Sight for Office 2013

Microsoft posted a reminder that connections from Office 2013 will no longer be supported for Office 365 service from October 13, 2020. Microsoft won’t take any action to block legacy clients, but the writing is on the wall. Office 365 tenants need to decide how to replace Office 2013 by either upgrading to Microsoft 365 apps for enterprise (click to run) or switching to browser clients like OWA.

Outlook’s Notification Pane for Office 365 Incidents

Outlook for Windows boasts a new admin notification panel where incidents affecting the Office 365 tenant show up. It’s an interesting idea, but you wonder if there aren’t more important things for the developers to work on, especially as many other ways exist for administrators to find out when problems happen.

Teams Messages from Hybrid Users Scanned by Communication Compliance Policies

Communications compliance policies scan user messages to detect violations of company or regulatory rules. A change introduces support for hybrid users whose mailboxes are on Exchange on-premises servers. The change might not pick up many new violations, but it does increase the coverage and stops some violations sneaking through, which is always a good thing.

Microsoft 365 Security for IT Pros Published

The New Microsoft 365 Security for IT Pros eBook is now available from Gumroad.com. The book is modeled after Office 365 for IT Pros and covers the essential steps tenant administrators should take to secure and defend their organizations. Security is something that everyone involved in tenant administration needs to think about, so it’s good to have some solid advice from the pros.

Reading PDFs Protected by Sensitivity Labels with the Edge Browser

The latest version of the Edge Chromium browser can read files protected by Office 365 sensitivity labels stored in SharePoint Online and Exchange Online. This might not be the feature that causes you to dump Chrome, but it’s very useful when your tenant uses sensitivity labels.