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Sending email as an alias (proxy address) with Office 365

Sending as Alias in Office 365

Sending emails in Microsoft Exchange world using an alias for an account has always been a pain. It required working with workarounds such as setting up Shared Mailbox or Distribution Groups and using SendAs permissions. For years admins around the world were asking Microsoft to change this, and finally, in April 2021, they did! It's a new feature of Office 365, and it requires action from Office 365 Administrator.

Enabling Sending as Alias in Office 365

To enable sending as an alias for all Office 365 users, you need to connect to PowerShell and enable this option. To do so, you must first install the ExchangeOnlineManagement module using the following command

Install-Module -Name ExchangeOnlineManagement -Force

Once installed, connect to your Office 365 tenant using Global Admin credentials.

Connect-ExchangeOnline

Verify the status of the Send From Alias option to make sure you know the state of it before applying any change

Get-OrganizationConfig | fl Sendfrom*

Finally, enable Send From Alias functionality for the whole tenant!

Set-OrganizationConfig -SendFromAliasEnabled $true

All that's left is some waiting time as the change propagates thru Exchange Online.

Sending as Alias in Outlook using Office 365

Once this is done all that is left is go to Outlook, and open new email.

Send As Alias in Office 365

Then, choose From, and from the list of all your emails, choose Other Email Address…

Send as Alias Office 365

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