MC1515939 - Sending from Aliases

Microsoft 365 Message Center announcement MC1515939.

MS Message Center's Summary

Exchange Online now offers general availability for sending emails from mailbox aliases. This capability gives users more flexibility by letting them send messages from any configured alias address. Rollout is currently under way and expected to conclude by December 2025. Administrators should review the feature settings in the Exchange Admin Center or via PowerShell to determine if enabling this capability benefits their organisation.

Administrator impact
Administrators can enable this capability through the Exchange Admin Center or PowerShell.
End user impact
Users gain the ability to send emails from any configured mailbox alias.
Importance
4/10: This is a standard feature rollout providing new functionality that requires administrative configuration.

Sending from Aliases general availability blog post

Microsoft Summary

Sending from Aliases is now generally available in Exchange Online, allowing users to send emails from any mailbox alias. Admins can enable it via PowerShell or Exchange Admin Center. Additional features are being explored, and no compliance issues have been identified.

Message Center ID
MC1515939
Category
plan For Change
Severity
normal
Services
Exchange Online
Tags
New feature, User impact, Admin impact
Published
2026-10-19
Last updated
2026-10-19
Expires
2026-12-15

[What and Why:] We're pleased to announce that Sending from Aliases is now generally available for Exchange Online. We are continuing to investigate additional capabilities, including per-alias display names, further filtering and default controls, and calendar support post GA. For more details on the feature, review the blog post below. [Rollout Schedule:] Available now. [Impact on Your Organization:] Who is affected: Users and admins in organizations using Exchange Online. What will happen: This feature allows users to send emails from any alias configured on their mailbox, improving flexibility and reducing the need for workarounds. [Action Required/Recommendations:] Admins can enable this feature via PowerShell or the Exchange Admin Center Settings. Learn more: Sending from Aliases is now generally available [Compliance considerations:] No compliance considerations identified. Review as appropriate for your organization.