Outlook: Sending an Email Message using a Proxy Address


This article describes how to send as a Proxy Address in Microsoft 365.

PLEASE NOTE: This feature is currently in Preview. You may encounter unexpected issues. This feature is currently only supported in Outlook on the Web; development is ongoing for integration with Outlook Desktop Application. If you encounter unexpected issues, please use the form at the bottom of this article.

What is a Proxy Address?

A Proxy Address is an additional email for your Primary Mailbox that you receive mail at, but have historically not been able to send from. With this feature enhancement, this is now possible. A good example of this is how in our consolidated Microsoft 365 environment, you may have affiliations with more than one system campus. Now, you are able to send as either address, not just your primary.

How to Choose Proxies to Automatically Show as Options

Navigate to Exchange Online, and then follow these steps:

  • Click the cog wheel in the upper right of your browser.
  • Click "View all Outlook Settings" on the bottom of the pop out window.
  • Choose "Mail - Compose and reply". Scroll halfway down to the "Addresses to send from" header.
  • Here, you will see values that you can choose from to automatically include in your "From" address.

PLEASE NOTE: The proxy addresses shown are controlled by your affiliation with the University System of New Hampshire. If there are questions on why you do or do not have an address you think you should have, contact your HR department (Employees) or University Registrar's Office (Students)

How to Send as a Proxy in Outlook on the Web.

  • Click the “New Message” button to compose an email.
  • Click on the three dots located at the right corner of the top pane.
  • Choose the "Show From" option.

  • Click on the "From" button (above the "To" button)
  • Click "other email addresses"

  • Enter your proxy address, and complete the message body and subject. Send the message.

Need additional help?

Please fill out this TDx Form with as much detail as possible, or contact the ET&S Help Desk team on your local campus.


Article ID: 3987
Wed 5/5/21 11:13 AM
Thu 4/28/22 3:20 PM
Applicable Institution(s):
Granite State College (GSC)
Keene State College (KSC)
Plymouth State University (PSU)
University of New Hampshire (UNH)
USNH System Office