Send email from aliases in Exchange Online

Microsoft made sending from email aliases generally available for Exchange Online on 7 October 2026, after a public preview that began in January 2022. An alias, also called a proxy address, is an extra SMTP address on the same mailbox. With the organization setting enabled, Exchange Online keeps that alias as the sender instead of rewriting outbound mail to the primary SMTP address. The setting stays off until you enable it for the tenant, and it applies only to mailboxes hosted in Exchange Online. Client, hybrid, and compliance limits still apply.
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