Each mailbox has its Primary Email address (UPN) and Alias email addresses that can be used to receive mail, but not to send mail. Your alias might vary from the Primary Email address in the Username part or Domain name part. Read the Knowledge Base articles on What Are Email Aliases for an Exchange Mailbox? for more information.

This article describes a workaround on how to send from your alias. Follow the instructions below for each user you need to be able to send from alias.

Set up Send as permissions in CONTROL PANEL

  1. Log in to CONTROL PANEL and navigate to Services > Exchange Mailboxes.
  2. Click Action next to the user in question and select Edit Email addresses:

    Edit Addresses
  3. Remove the alias you want to send from and wait a couple of minutes:

    Remove Alias
  4. Navigate to Services > Distribution Lists and click Create New Distribution List.
  5. Specify the name and assign to this new Distribution list the previously deleted email address (former alias you want to send from):

    Create DL
    Note: If the error stating that the email address is already registered appears, it means that the alias has not yet been removed completely from our system. Try again in 5 minutes.
    Name Taken Error
  6. Add the user in question as a member of this distribution list:

    Add Address
  7. Navigate to the Distribution List settings > click on Send as option
    Send as
  8. Select the mailbox that needs to have Send as permissions > click Grant Send As Permissions button

Note: after the permissions are granted in the CONTROL PANEL, it can take up to 2 hours to propagate the changes

You can now send from this address using Outlook or OWA .

Send as in Outlook:

In Outlook 2010/2013/2016:

  1. Compose a New Email. Click the From field and select Other email address.
    • Note: If you do not see the From field, navigate to Options and select From in the section Show fields.
  2. Select the alias from the Global Address List or type the email address manually.
  3. Send the email from your alias.

In Outlook for Mac:

Read the Knowledge Base article on How To Send As A Distribution List In Outlook 2011 for more information.

Note: sending as a Distribution List doesn't work in Outlook 2016 for Mac.

Send as in OWA:

In OWA 2010:

  1. Compose a New Email. Click Options on the top.
  2. Check the box Show from and click OK.
    Show from
  3. Click the From field and select Other email address.
    From > Other email address
  4. Select the alias from the Global Address List or type the email address manually.
    Find the address

In OWA 2013/2016:

  1. Compose a New Email. Click on Show From option.
    Show From
  2. Click on your own email address, it will get selected, and press Delete keyboard button.
    Delete address
  3. Type in new alias email address manually in From field and send a test email.
    Type address
  4. Next time you want to send a message using another address it will be available for selection in the drop-down for From field.
    From switch