Exchange Online Starts Blocking EWS on October 1, 2026: How to Check Your Exposure and Buy Time With EwsAllowedAppIDs October 1, 2026 is when Microsoft starts disabling Exchange Web Services access by default across Exchange Online tenants. If your... Sep 25, 2026 5 min read Exchange
Exchange Online Is Now Throttling and Blocking Outdated Exchange 2016/2019 Hybrid Servers: Are You Below Baseline? Since the second week of September 2026, Exchange Online has been actively throttling and, eventually, blocking mail from Exchange 2016... Sep 24, 2026 5 min read Exchange
How to Fix Domain Reputation Block in Microsoft 365 When your sending domain earns a poor reputation, Microsoft 365 starts throttling or blocking its mail, and messages land in... Dec 14, 2025 3 min read Microsoft
Send as Alias from Microsoft Outlook mobile app (iOS and Android) The Outlook mobile app for iOS and Android shows only the primary SMTP address in the From field, so aliases... Dec 14, 2025 3 min read Microsoft
