Office 365 - Authorize send as address

This document explains how to authorize send as addresses for your account. What this means is that you can then send emails that appear to come from the addresses that you've authorized to send as.

Note: While these instructions are listed being for Office 365, the process to make this change is the same for WiscMail users.

Office 365 restricts users from sending mail that appears to come from another address. The only way to perform this behavior is to provide a specific authorization to send from the address which is detailed in this document. This restriction has now also been applied to WiscMail, and so users who want to send as another address will need to authorize the address first.

Important: If you were previously 'sending as' another address prior to this new restriction being applied (2/3/2015), you are given a special exemption from needing to authorize current or new addresses while you are still in WiscMail. Users in Office 365 will be required to authorize each account they want to send as regardless of previous exemption.

Authorizing new 'Send As' Address

For the below steps we will assume that the NetID address is attempting to add the account as an authorized 'send as' address.

  1. Log in to the Wisc Account Administration site with your NetID credentials.

  2. Select the account you want to manage. . If you do not see the account you want to manage or are placed into your NetID account, review the following document: Wisc Account Administration site - Logging in.

  3. Next, choose account administration from the left-hand column


  4. In the drop down menu select the send as address option.


  5. In the empty field next to send as address as shown below, enter the email address you want to be able to send as and press verify address. For this example, enter ''.


  6. An email will now be sent to the account you are authorizing ( You will need to login to WiscMail/Office 365 to check the account's email for a verification code. The email will look like the example below:


  7. Re-login to the Wisc Account Administration site with your NetID credentials ( and navigate back to the send as address page.
  8. Once again enter the email address that you want to authorize as well as the verification code and press the verify address button.

The NetID account in the example above will now be able to send emails that appear to come from

Send as permissions versus Authorized send as Addresses

You may be wondering what the difference is between the Permissions tool's 'send as' permissions and the authorizing of 'send as' addresses mentioned on this page. The difference comes down to what accounts are able to be added as send as addresses. On the permissions page, users must be in Office 365 and can only add other Office 365 accounts because that page adds an Office 365 specific permission from one account to another. The tool documented above is used to add authorization via SMTPAuth from one account to another. What this means is that users can add external email addresses here (e.g. WiscMail as well as say, Gmail).

Keywords:microsoft office365 o365 authorizing authorized sending permissions accounts emails   Doc ID:46725
Owner:Ara M.Group:Office 365
Created:2015-02-03 12:29 CDTUpdated:2017-06-08 13:23 CDT
Sites:DoIT Help Desk, DoIT Tech Store, Office 365
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