Delete unused email addresses?

Question

How do I delete old email addresses which do not exist anymore?

Answer 1

Hello,

Please let me know where you want to delete the email account?

A screenshot would be helpful.

Thank you.

Answer 2

If the goal is to remove unused or obsolete email addresses from Microsoft services, the options depend on where those addresses are stored or used.

1. Remove an email account from classic Outlook for Windows If the old addresses are set up as accounts in classic Outlook for Windows (Microsoft 365 subscription, Outlook 2019, or Outlook 2016):
2. Open classic Outlook for Windows.
3. Select File (top-left).
4. Select Account Settings > Account Settings.
5. In the Email tab, select the account (old email address) to remove.
6. Select Remove.
7. Confirm the warning that offline cached content for that account will be deleted from the computer, then select Yes.

This stops Outlook from sending/receiving mail for that address on the PC. It does not deactivate the email account at the provider.

2. Remove an email address from an Exchange mailbox (admin scenario) If the old addresses are secondary addresses on an Exchange mailbox (for example, in a work or school environment), an administrator can remove them.

Using the Exchange admin center (EAC):

1. Go to Recipients > Mailboxes.
2. Select the mailbox that has the old address and choose Edit.
3. Open the Email Address tab.
4. Select the old email address and choose Remove.
5. Select Save.

Using Exchange Management Shell / PowerShell:

Set-Mailbox "User Name" -EmailAddresses @{remove="oldaddress@example.com"}

To remove multiple addresses:

Set-Mailbox "User Name" -EmailAddresses @{remove="old1@example.com","old2@example.com"}

To verify removal:

Get-Mailbox <identity> | Format-List EmailAddresses

3. Remove an email alias from a Microsoft account (important limitation) If an old address is an alias on a Microsoft account (for example, an @outlook.com or @hotmail.com alias), removing it is permanent and it cannot be re‑used on any Microsoft account again. This behavior is documented in the Outlook.com alias article referenced in the Q&A excerpts. Removing such an alias is only appropriate if it is truly no longer needed.
4. Remove suppressed or blocked email addresses in Dynamics 365 Customer Insights – Journeys If the concern is about old or invalid addresses in a suppression list used for marketing emails:
5. In Customer Insights – Journeys, open Contacts.
6. Select the contact and go to the Communication tab.
7. For addresses in the On suppression list category, select Remove from suppression list if they are eligible.

Addresses marked Permanently blocked cannot be removed because they are ineligible or will be re‑suppressed immediately.

---

References:

• Remove or delete an email account from classic Outlook for Windows
• Add or remove email addresses for a mailbox
• Add or remove email addresses for a mailbox in Exchange 2013
• How Customer Insights - Journeys uses suppression lists for email deliverability
• I realize I have 2 different accounts. How do I combine the 2? - Microsoft Q&A
• Deleted hotmail email address from account - can I get it back? - Microsoft Q&A
• MSN email issues - Microsoft Q&A
• How to add an existing outlook.com account to my existing microsoft account? - Microsoft Q&A
• Lock or block login attempts - Microsoft Q&A
• Address books FAQ