Easily enhance your mailbox by setting up proxy addresses to add or remove email addresses as needed. Streamline your communication. A proxy address lets a user receive an email sent to a different email address. Email messages sent to the user’s proxy address reach their primary email, SMTP, or default reply address.

You can use the EAC or the Shell to add or remove an email address for a user mailbox. You can configure more than one email address for the same mailbox. Proxy addresses, or additional addresses, enable users to receive emails directed to different addresses. These emails are then forwarded to the primary or default email address.

Decide if to include it: Users can have primary and secondary proxy addresses.
The user uses the primary proxy address to efficiently send emails to the foreign system.

Secondary proxy addresses become active upon receiving emails from foreign systems, aiding seamless communication.

Recipient Matching and Proxy Addresses in Active Directory

Incoming messages match the recipient in the message to secondary proxy addresses in Active Directory, locating the proper recipient object.

Note: On the Email Address page, the primary SMTP address is displayed in bold text in the address list, with the uppercase SMTP value in the – Type column.
– Click Add Add icon, and then
– Click SMTP to add an SMTP email address to this mailbox.

Note: SMTP is the default email address type. You can also add Exchange Unified Messaging (EUM) addresses or custom addresses to a mailbox. For more information, see “Change user mailbox properties” in the Manage user mailboxes topic.
Type the new SMTP address in the Email address box, and then click OK.
The new address is displayed in the list of email addresses for the selected mailbox.
Click Save to save the change.

Using the Shell to add an email address

The EmailAddresses property holds mailbox email addresses. It’s multivalued, allowing multiple addresses. Below are examples of modifications. To illustrate, we add an SMTP address to Dan Jump’s mailbox.

Set-Mailbox "Dan Jump" -EmailAddresses @{add="dan.jump@xxxxxxxxx.com"}

This example shows how to add multiple SMTP addresses to a mailbox.

Set-Mailbox "Dan Jump" -EmailAddresses @{add="dan.jump@xxxxxx.com","danj@xxxxxx.com"}

For more information about how to use this method of adding and removing values for multivalued properties, see Modifying multivalued properties. This example shows another way to add email addresses to a mailbox by specifying all addresses associated with the mailbox.

In this example, danj@xxxxxxx.com is the new email address that you want to add. The other two email addresses are existing addresses. The address with the case-sensitive qualifier SMTP is the primary SMTP address. You have to include all email addresses for the mailbox when you use this command syntax. If you don’t, the addresses specified in the command will overwrite the existing addresses.

Set-Mailbox “Dan Jump” -EmailAddresses SMTP:dan.jump@xxxxxxx.com,dan.jump@nxxxxx.com,danj@xxxx.com

I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.