How to use plus addressing in Microsoft 365 Exchange Online? ,

addressed as well (sometimes called sub address) allows you to use unique dynamic SMTP e-mail addresses for your mailbox. It is commonly used to protect against spam, track marketing companies, and categorize e-mail into mailboxes using inbox rules.

What is e-mail plus addressing in

Here is what it looks like:

  • Example SMTP address with basic syntax: <mailbox_name>@<>
  • Also addressing the SMTP syntax: <mailbox_name>+<tag>@<></li>

For example, the SMTP address of your mailbox is [email protected], If your e-mail provider supports plus addressing, this means that e-mail sent to SMTP addresses such as will be delivered to your mailbox.

You can use any set of characters instead Word in this instance.

When processing incoming email, modern mail services that support plus addressing (, Gmail, Yahoo, iCloud, Exchange Online), “,” character as a special indicator that demands every character after it be ignored and e-mail delivered to your mailbox’s default SMTP address. This means you can have an unlimited number of unique SMTP addresses for a single mailbox. Can be addresses.

Using Email Plus Addressing

The plus (“+”) character is defined in RFC-5233 as a valid character for email addresses.

Plus Addressing Features:

  1. Plus addresses are only used to receive e-mail, not send them;
  2. You do not need to list additional SMTP addresses for your mailbox in advance. E-mail sent to any Plus address in your mailbox will be delivered;
  3. Some online forms and services do not allow it to be used , symbol when filling in the email field;
  4. If you configure inbox rules to process e-mail sent to plus addresses, you must use a condition for field. To , CC , BCC,
  5. Those messages appear as redirects in the tracking log. With distribution groups, they resolve to the recipient’s actual address (two trace entries: one from the sender to the plus address and one from the sender to the actual recipient’s address).

Some scenarios of using plus addressing:

  • For example, when I register on a website site1I give an e-mail like In place of the real address and if the email database from the site is publicly leaked, you can use filters to detect the leak source and automatically move all e-mail sent to the compromised email address to spam. be able to make;
  • It’s also convenient to send an e-mail with the note to yourself. address and it will automatically be moved to the Notes folder using inbox rules (or you can automatically categorize such messages).
  • You can register multiple accounts with unique email addresses on a particular service, but all e-mail will be delivered to a single mailbox.
  • Using plus addressing is useful for marketers when they are running various promotions and want to track an advertiser’s contact by email address.

How to Enable Plus Addressing in Exchange Online?

Exchange Online (Microsoft 365) has supported PLUS addressing since 2020. From April 2022, this feature is enabled by default for all tenants.

You can enable/disable this feature from Exchange admin center.

  1. go for Adjustment , mail flow,
    Enable Plus Addressing in Microsoft 365 / Exchange Online
  2. Turn off plus addressing for your organization is disabled by default.

You can also enable or disable plus addressing for your tenant with PowerShell.

Connect to your Exchange Online tenant using the EXOv2 module:


Check Facility Status:

Get-OrganizationConfig|Select *Plus*

AllowPlusAddressInRecipients with PowerShell

AllowPlusAddressInRecipients DisablePlusAddressInRecipients
---------------------------- ------------------------------
True False

Microsoft does not recommend manually assigning SMTP addresses for tenant users with plus characters in the form of SMTP addresses. You can find such addresses using the below PowerShell command:

Get-Recipient -Filter 'emailaddresses -like "*+*"' | FT Name, EmailAddresses

In current on-premises Exchange Server versions, dynamic plus addressing is not supported, but an administrator can manually add additional SMTP aliases with + for users (then they will be normal SMTP aliases/proxy addresses):

Set-Mailbox j.warner -EmailAddresses @{add="[email protected]"}

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