Mail Flow
The latest Mail Flow coverage — news, analysis, and updates from the WindowsNews.AI desk.
Microsoft Tightens Rules for Third-Party Email Filters: What It Means for Your Inbox Security
Microsoft has released reinforced guidance for organizations routing Microsoft 365 email through third-party security services, warning that misconfigured connectors and inline scanning can break...
Microsoft Slaps 100-Recipient Daily Limit on onmicrosoft.com Outbound Email to Thwart Spammers
Microsoft is pulling the plug on unrestricted outbound email from its shared onmicrosoft.com domains, imposing a hard cap of just 100 external recipients per tenant every 24 hours. The change,...
Microsoft Slashes onmicrosoft.com Outbound Email to 100 Recipients Daily to Fight Spam
Starting October 15, 2025, Microsoft will begin enforcing a hard cap of 100 external email recipients per 24 hours for all tenants sending from the default onmicrosoft.com domain. The move, announced...
Microsoft's Enhanced Message Trace in Exchange Online: The Ultimate Guide for IT Admins
Microsoft has unveiled a major overhaul of Exchange Online's Message Trace feature, delivering powerful new capabilities for IT administrators managing cloud email environments. The redesigned tool...