List all allias in m365 with a for a specific username

To list all aliases (email addresses) associated with the mailbox [e-mail] in Microsoft 365, here are the most common and reliable methods.

✅ Method 1: Microsoft 365 Admin Center (GUI)

1. Go to https://admin.microsoft.com

2. Navigate to Users → Active users

3. Click on [e-mail]

4. Select Mail tab

5. Click Manage email aliases

👉 You’ll see:

• Primary SMTP address

• All secondary aliases (smtp:)

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✅ Method 2: Exchange Admin Center (GUI)

1. Go to https://admin.exchange.microsoft.com

2. Navigate to Recipients → Mailboxes

3. Click [e-mail]

4. Open Email addresses

This shows:

• Primary email

• All aliases

• Proxy addresses (SMTP, SIP, etc.)

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✅ Method 3: PowerShell (Recommended for Accuracy)

Step 1: Connect to Exchange Online

Connect-ExchangeOnline

Step 2: Get all aliases for the user

Get-Mailbox test@example | Select -ExpandProperty EmailAddresses

Optional: Show in a cleaner format

Get-Mailbox [e-mail] |
Select DisplayName, PrimarySmtpAddress, EmailAddresses

SMTP-only aliases

Get-Mailbox [e-mail] |
Select -Expand EmailAddresses |
Where-Object { $_ -like "smtp:*" }

🔹 SMTP: (uppercase) = Primary 🔹 smtp: (lowercase) = Aliases

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✅ Method 4: Azure AD (Less Complete – Not Recommended)

Azure AD does not always show all mail aliases, so use Exchange methods instead.

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🔐 Required Permissions

You need one of these roles:

• Global Admin

• Exchange Admin

• User Administrator