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Most RecentMost ViewedMost LikesIntroducing 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). Announcing Public Preview of the New Message Trace in Exchange Online We are excited to announce that the Public Preview of the new Message Trace in the Exchange admin center (EAC) in Exchange Online. Sending From Email Aliases – Public Preview We started a journey toward making aliases first-class addresses in Exchange Online. We are excited to announce that we’ve reached the first milestone of this journey. Exchange Online to introduce External Recipient Rate Limit Today, we are announcing that, beginning in January 2025, Exchange Online will begin enforcing an external recipient rate limit of 2000 recipients in 24 hours. Public Preview: High Volume Email for Microsoft 365 Today we’re thrilled to announce the public preview of High Volume Email (HVE) for Microsoft 365. 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) in September 2025. Implementing Inbound SMTP DANE with DNSSEC for Exchange Online Mail Flow In May 2024, Microsoft is releasing a Public Preview for Inbound SMTP DANE with DNSSEC for Exchange Online mail flow. Announcing General Availability of Inbound SMTP DANE with DNSSEC for Exchange Online Today, we are excited to announce the General Availability of Inbound SMTP DANE with DNSSEC! Updates to High Volume Email (HVE) Public Preview We are excited to share some updates to High Volume Email (HVE) Public Preview. Introducing MTA-STS for Exchange Online We have been validating our implementation of the MTA-STS standard and are now pleased to announce support for MTA-STS for all outgoing messages from Exchange Online.
