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How To: List All Mailbox Aliases With PowerShell

    Whether I am onboarding a new client, or trying to figure out who is watching an email address in our organization – there is nothing more frustrating than trying to play “pin the alias on the mailbox.” One day I decided enough was enough and wrote some PowerShell to solve this problem.

    How To List All Mailbox Aliases in Office 365 or Exchange Online

    Even though the meat of this task is a single command – there is a bunch of the usual PowerShell fluff required to get connected to Office 365.

    Install ExchangeOnlineManagement First

    If you don’t already have the cmdlets needed to talk to Exchange Online, you will first need to bust open a PowerShell prompt and run:

    Install-Module -Name ExchangeOnlineManagement

    Once you have ExchangeOnlineManagement installed, save the following as GetAliases.ps1 (or whatever you want, doesnt matter, just as long as it has the .ps1 extension.

    # Import The PowerShell module for Exchange Online 
    Import-Module ExchangeOnlineManagement
    # Connect to Exchange Online 
    Connect-ExchangeOnline -UserPrincipalName
    # Export the list to CSV
    Get-Recipient | Select DisplayName, RecipientType, EmailAddresses | Export-Csv EmailAddresses.csv

    Once you’ve saved the script – run it. It will save a .csv file local to where the script was run. I must warn you, however, that the output will be ugly as sin; but if you have more than 3 mailboxes, clicking through each one to figure out all the aliases associated with said mailboxes will be a laborious drudge of your time, and running the script will save you a ton of frustration.


    So, the above script will collect all the mailboxes in your Exchange Onliine/Office 365 tenant, the associated aliases to each account, and spit that information into a .csv file that you can visually go through, or apply further after-processing.

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