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Plus Addressing Now Available in Exchange Online

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The_Exchange_Team
Icon for Microsoft rankMicrosoft
Oct 27, 2020

As announced at Microsoft Ignite 2020, support for plus addressing is now available in Exchange Online. Thanks to our UserVoice site, this feature was identified as the number 1 request for Exchange Admins and we acted on that to bring it to Exchange Online.

Plus addressing allows users to dynamically create unique email addresses that deliver messages to a user’s mailbox, but are easily distinguished from messages sent to the user’s regular email address. There are two main use cases for this. Some customers want to filter incoming email and move certain messages to their own folders. Other customers have business solutions (such as support ticketing systems) that add a case ID to an email address to help track support threads.

Support is currently scoped to mailboxes with support for distribution lists and Groups expected in December 2020.

Plus addressing can be enabled for your organization via PowerShell. The instructions to enable it can be found here.

Additional documentation for the PowerShell command used can be found here.

We really hope you enjoy this new feature we’ve added to Exchange Online, and as always we want to hear your feedback, either here on the blog or over on UserVoice.

Sean Stevenson

Exchange Online Transport Team

Updated Oct 27, 2020
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  • HotCakeX's avatar
    HotCakeX
    MVP
    Nov 10, 2020

    Kam No, normal free Outlook accounts work fine.

    these are applied only to Exchange online.

  • Andres-Bohren's avatar
    Andres-Bohren
    Steel Contributor
    Nov 16, 2020

    Hi All,

     

    Sean_Stevenson 

    I have opened a Microsoft Case.

    Result of the MS Case: 

    The Option Plus Addressing is not released for Exchange Hybrid Environment. 

     

    Would be nice, if such Informations where already in the initial Blog entry.

    As there is a Reference in the Blog to Distribution Groups and Office 365 that they will come later...

     

    Regards

    Andres

  • bbzome's avatar
    bbzome
    Copper Contributor
    Aug 13, 2021

    On hybrid environments, mailboxes on-premises can't send emails to "Plus Addressing" mailboxes hosted on Exchange Online with "Recipient not found by SMTP" error.

    I expect, at least, that Exchange On-premises knows how to route those messages to Exchange Online.

  • benoitrando's avatar
    benoitrando
    Brass Contributor
    Aug 18, 2021

    Hello, 

     

    Microsoft announced that the PLUS Addressing will be activated by default to all Tenant .

     

    If I correctly understood, the plus addressing is ONLY working where the MX record or the incoming entry point for email is located in Exchange online . As we still have our MX record located in our on-premise gateway and all incoming emails are still going through our Email gateways, then the PLUS addressing will not work . 

     

    Could you confirm this ?

     

    Thanks

  • Sean_Stevenson's avatar
    Sean_Stevenson
    Icon for Microsoft rankMicrosoft
    Aug 20, 2021

    Hi all,

     

    There are many complex routing configurations in our service. We cannot document an exhaustive list of different combinations and how they affect plus addressing. 

    The plus addressing functionality exists in EXO and if a message can make it to EXO, it will have the Envelope P1 Recipient stripped of everything after the + thereby allowing it to be delivered with the regular mailbox address after that.

     

    If there is a specific scenario you are not sure about, I encourage you to validate for yourself if and when plus addresses are usable.