Most RecentMost ViewedMost LikesExchange Online canceling the Mailbox External Recipient Rate Limit The Mailbox External Recipient Rate Limit in Exchange Online is being canceled. Cloud-Managed Remote Mailboxes: Now Generally Available! We are happy to announce General Availability of cloud-managed Remote Mailboxes. Demystifying Exchange Online Mailbox Quotas We wanted to do a deeper dive into various types of mailbox quotas in Exchange Online. Exchange Online to retire Basic auth for Client Submission (SMTP AUTH) Today, we are announcing that Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) starting March 2026. Auto-Archiving for Exchange Online We are happy to announce the time-based archiving feature for Exchange Online users with archives. Limiting 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. High Volume Email: Continued support for Basic Authentication & other important updates This announcement provides several important updates for High Volume Email. Updates to High Volume Email (HVE) Public Preview We are excited to share some updates to High Volume Email (HVE) Public Preview. 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). Local Move Requests in Exchange Online – Why They’re Not Supported We wanted to explain why using Local Move Requests in Exchange Online is not a good idea as a general practice.
