Most RecentMost LikesMost ViewedLimiting Onmicrosoft Domain Usage for Sending Emails We are announcing that all Exchange Online customers who send external email should start switching to custom (aka vanity) domain names. Introducing Exchange Online Tenant Outbound Email Limits We’re introducing new tenant-level outbound email limits (also known as the Tenant External Recipient Rate Limit or TERRL). Replacing IIS SMTP virtual server with Exchange Edge Transport How to go about replacing IIS SMTP virtual server with Exchange Edge Transport. Introducing more control over Direct Send in Exchange Online Read about a new feature that gives you more control over Direct Send in Exchange Online. Change Optics Report released into Public Preview to showcase messages impacted by future changes We wanted to tell you about a new Change Optics Report that is now in Public Preview. Updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline We wanted to provide the updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline. How to pause throttling and blocking of out-of-date on-premises Exchange Servers We wanted to share how to temporarily pause throttling and blocking of out-of-date on-premises Exchange Servers, if they are sending email to Exchange Online. Multi-Geo In-Region Routing General Availability We’re excited to share that Multi-Geo In-Region Routing reached General Availability in December 2025. Modernizing DNS Security for Exchange Online Mail Flow We wanted to provide a few updates related to modernizing DNS Security in Exchange Online. Streamlined Moderation Approvals, Now in All Outlook Clients We wanted to let you know about upcoming changes to Exchange Online message moderation.
