How-to Send email from Alias in Office 365 and Outlook

A long-requested feature to send emails from an alias in Office 365 seems to be finally released. The feature has not been announced yet, but it’s already documented in the service description and seems to work fine.

This new feature should become available for Outlook on Windows this month and for Outlook Online later this year according to the roadmap. But I have tested both and it seems to work in Outlook Online as well.

When you use an alias to send an email from it will be preserved in the From and Reply to field for the recipient. The recipient will see only your alias and not your primary email address.

Enable Send Email from Alias Office 365

The send from alias option is turned off by default, so if you want to use this feature you will need to enable it in the Exchange Online Admin center or with PowerShell.

  1. Open the Exchange Admin Center
  2. Click Settings > Mail flow
  3. Enable Turn on sending from aliases
office 365 send as alias
office 365 send as alias

You can also enable plus addressing if you want to use that as well. Read more about it here.

Using PowerShell

Make sure you have the latest Exchange Online PowerShell module installed when using the PowerShell option. We can enable the feature by setting the SendFromAliasEnabled to True in the organization config:

# Connect to Exchange Online
Connect-ExchangeOnline -UserPrincipalName [email protected]

# Enable Send from Alias
Set-OrganizationConfig -SendFromAliasEnabled $true

It can take a couple of minutes until the feature is fully working in your tenant. During my first test, I could send the mail from the alias, but the reply-to field wasn’t set. The recipient just saw my primary email address.

After waiting another 5 minutes and testing it again everything worked as expected.

How to Send as Alias in Outlook

Your Microsoft Office 365 administrator will need to add an alias to your account first before you can use this feature. Users can’t create aliases themself.

To send mail from your alias address in Outlook is pretty simple. Make sure that the From field is displayed (otherwise enable it under options).

  • Select From
  • Choose Other email address..
  • Type your alias and click Ok

The next time you can just select the alias from the dropdown menu in the From field.

outlook send as alias

I have tested it by sending email from the alias to Gmail and other Exchange Online tenants and everything seems to work. The recipient only sees the alias address and the reply goes back to the alias as well.

Receive mail from alias

How To Send as Alias in Office 365

You can also send emails from your alias address in Office 365 with Outlook Online. The initial setup is the same, you will need to enable the feature with PowerShell as described above.

Step 1 – Add the From field

  1. Click on New Message in Outlook Online.
  2. Click on the 3 dots
  3. Choose Show From in the dropdown menu
send from alias office 365

Step 2 – Add your Alias Address

Now we will need to add your alias address. The first time we will need to type the address, the next time you can easily select it.

  1. Click on From
  2. Choose Other email address…
office 365 send as alias

Step 3 – Send as Alias

You can now type in your alias address in the From Field. And when done click on Send.

send email from alias office 365

Wrapping Up

Because the feature to send email as alias in Office 365 has not been official released yet by Microsoft you should be careful with using this for important emails. Just keep an eye on the roadmap or the message in the Admin Center to known when this option is fully supported.

If you have any questions just drop a comment below.

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41 thoughts on “How-to Send email from Alias in Office 365 and Outlook”

  1. Currently in Outlook Online, I have to type a space after entering alias to validate this alias.
    If I don’t do this, the address book contact is selected… with its main mail address.

      • It is possible. As I described before, there’s a new setting on the Outlook website. Click on the Settings cog, View All Outlook Settings, Compose and Reply, scroll down and you’ll find “Addresses to send from”. From there, “you can choose which addresses to appear in the dropdown in the From field”.
        This setting carries over to the Outlook app for Android (Don’t know about iPhone since I don’t have one to test) and the Windows Mail app.

  2. I have an issue with the outlook client. It works with OWA (after more than 1 week) , but for the client , the address is always changed back to the main address.

    Do you have any solution?



  3. Good news. There’s a new setting on the Outlook website. Click on the Settings cog, View All Outlook Settings, Compose and Reply, scroll down and you’ll find “Addresses to send from”. From there, “you can choose which addresses to appear in the dropdown in the From field”.

    Ironically, this doesn’t seem to work on the Outlook website. There’s no dropdown menu in the From field, at least in my case, and I still had to click on From and type in the alias address manually.

    However, this setting does carry to the Outlook for Android app and the Mail app on Windows, so you can now easily send from an alias if you’re using any of those apps, which is very convenient.

  4. Instructions worked well for me. I juste had to install this before I could do it \Set-OrganizationConfig -SendFromAliasEnabled $true

  5. This worked for me. I can make a video for those who were still unable to do it. The only inconvenience I have is the following:

    1. When using the Alias, the name displayed in the recipient’s inbox still remains the main account’s name. For example, they will see displayed Stephanie Brown ([email protected])
    As you will see, the names will not match the alias’ name and I still was unable to find the way to set up the Displayed Name for each Alias.

    2. Signature: There is no way to add a signature to a specific Alias and worse if using Outlook web.

    3. You cannot reply automatically with the same Alias.

    All these features are so easily managed in Gmail (GSuite). There is no need to browse into the twilight web to find the answers.

    I hope to be wrong and that someone can show me a solution or that Microsoft takes interest in providing a complete solution at once.

  6. I enabled the feature around 15 hours ago, and it’s still not working in my tenant both via OWA and O365 version of Outlook that I’ve just fully updated.
    Also, reading the comments above it doesn’t even seem worth it, if (when it’s working) end-user A can only send the very first email from an alias, but when they receive a reply from end-user B, then end-user A can’t reply from the alias?

      • Lol I’d love to know how much time (I’ve been waiting almost 48 hours, and I’ve just checked again, but still not working!). I’ve triple-checked in Powershell to confirm that the setting is enabled. But in any case, the fact that you have to choose the alias every time, even on replies, is not going to wash with my CEO, and annoyingly I don’t see that mentioned in the grand Microsoft article which announced the availability of this feature that has been requested for like 20+ years!

  7. Any resolution on Adam’s question?

    Adam Lloyd
    July 16, 2021 at 03:22 | Reply
    Is there any way to reply as alias when someone has sent to the alias?
    When I respond to an email sent to the alias it defaults to the primary email.

    • How long have you waited before you tested it? I know that it takes some time for some tenants. The rollout was postponed and started last month, so it can take some time before the feature is available in your tenant.

  8. Hey!
    Thanks for the tutorial, really helped me.

    Is there any way to reply as alias when someone has sent to the alias?

    When I respond to an email sent to the alias it defaults to the primary email.


  9. What is the difference between this Alias and simply adding a SMTP mail address to a user’s account? They would still have to get it to work by selecting the ‘From’ Email address and selecting the alternate SMTP mail address in Outlook.

  10. Yeah not working here yet either. Everything is already setup and waited a whole day but emails still show the default email. Funny that the documentation still says that the feature “is rolling out in April 2021”.

  11. Not sure what MS is up to but still can’t get it too work.

    Says enabled in power shell from when I set ti up but still sends emails as default account after changing the from field

  12. Still not working after 3 hours. I checked the Road Map and it says it is still in development and has not been rolled out yet.

    • I have checked the roadmap and the rollout has been shifted to jun 2021. It was April this year. So it’s possible that the feature hasn’t been rolled out to your tenant yet.

  13. This works sofar for OWA I’m having issues with sending from Outlook. I believe it is because the aliases are not visible in the GAL. Or do I need to setup a proxy attribute in the exchange online center. The tenant is also a GCC environment. Any suggestions how to resolved the Outlook send from would be appreciated.

    • The easiest way of using an alias to send is to setup a pop account with SMTP authentication. Been using the trick for years.

  14. I just set this up and when I receive an email on my corp outlook or my protonmail web client sent via the alias assigned in Exchange 365 I still see the full (non-alias) email address in the from and also the reply.

    I am able to send via the alias as I was not able to previously, however the observation I am making is that the default email / user is being displayed in the sender field.

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