Support for microsoft plus

Plus addressing is available in Outlook. By default, plus addressing support is disabled in Exchange Online. Since Exchange Online has always supported regular email addresses that already contain the plus sign, if you enable plus addressing, these email addresses might stop working.

If your organization's email is routed through Exchange Online to your on-premises servers, mailboxes hosted on-premises will also be able to use plus addresses. Connect to Exchange Online PowerShell. This feature was rolled out behind a setting because, historically, customers have been able to use plusses in addresses for mailboxes in Exchange Online and on-premises servers. When this feature is enabled, Exchange Online will first check if the full address can resolve to a mailbox that the service is aware of.

It is only when that resolution fails, that a plus is looked for and a second attempt to resolve the address without the plus and tag is done. This means that the feature is compatible with addresses containing plusses that Exchange Online knows about. This article doesn't apply to the Office Professional Plus, Professional, and Standard editions. To learn about the support dates for the Office Professional Plus, Professional, and Standard editions, search Microsoft Lifecycle.

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