Microsoft said that Office 365 tenants with weak configurations and who don't have strict anti-spoofing protection enabled ...

Valimail, a provider of email authentication services, has joined the Microsoft Intelligent Security Association and will offer DMARC coverage free to Microsoft Office 365 customers. The objective is ...

Microsoft has enabled Authenticated Received Chain (ARC) for all for Office 365 hosted mailboxes to improve anti-spoofing detection and to check authentication results within Office 365. ARC is a ...

Microsoft is working on adding custom Authenticated Received Chain (ARC) configuration support to Microsoft Defender for Office 365. ARC is an authentication mechanism that provides an authenticated ...