Outlook Login Problems

How to Remove an Unwanted Alias from an Outlook Account

Muhammad Talha Sep 30, 2026 869 views

Question details

The user needs to remove or bypass an unexpected alias on an Outlook account with a custom domain that is interfering with Outlook 2019 address matching.

How to Remove an Unwanted Alias from an Outlook Account

Product: Microsoft Outlook 2019
Device & OS: not provided
Scenario: Setting up or logging into an Outlook account with a custom domain.
Observed behavior: An unexpected alias appears as the web logon name, preventing Outlook 2019 from matching the account to the address list. The alias is hidden from standard account settings.

Before you start

Ensure you have your original custom domain email credentials and back up any local Outlook data files before creating a new profile or modifying account aliases.

Solution 1Recommended

Change the Primary Alias to an Outlook.com Domain

Resolve the address matching issue by temporarily making a native Outlook.com or Hotmail.com alias the primary one, then re-adding the account in your mail client.

Microsoft sometimes assigns a random Outlook address to custom domain accounts. By manually setting a standard Microsoft domain as the primary alias, Outlook 2019 can correctly identify and match the account.

Sign in to Microsoft Account

Edit Account Info

Select 'Edit account info' to view your current list of email aliases.

Set Primary Alias

Choose an existing Outlook.com or Hotmail.com email address from the list and click 'Make primary'.

Re-add Account in Outlook

Open Outlook 2019, remove the problematic custom domain account via File > Account Settings, and re-add it using the newly set primary alias.

Change the Primary Alias to an Outlook.com Domain

Microsoft Alias Guidance: If you don't have an Outlook.com alias, you will need to click 'Add email' in the account settings to create one before setting it as primary.

Solution 2

Configure the Account Manually as IMAP or POP

Bypass Exchange configuration issues by setting up a new Outlook profile and using standard IMAP/POP protocols.

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Frequently Asked Questions

Why does my custom domain Outlook account have a random alias?

Microsoft automatically generates a temporary Outlook.com alias for custom domain accounts (like personalized domains) to facilitate backend login to Microsoft services when a native Outlook.com address isn't set as the primary one.

Will removing an alias delete my emails?

Removing an alias only deletes that specific login name and address. It does not delete the emails, contacts, or calendar events stored in the primary Microsoft account, but you will no longer receive mail sent to the removed alias.

Where can I manage my Outlook account aliases?

You can manage your aliases by logging into account.microsoft.com, navigating to the 'Your info' tab, and selecting 'Edit account info' under the Account Info section.

How do I remove an account in Outlook 2019?

Go to File > Info > Account Settings > Account Settings. Select the email account you want to remove from the list, click 'Remove', and confirm the action.

Outlook & Email Problems