account change to USAA Support

This usually points to a display name, alias, or account configuration issue rather than a Windows update changing the actual mailbox owner.

Try these checks in order:

1. Check whether the wrong name is only a display issue
   • Send a message to another address controlled by the account owner.
   • Open the sent message and inspect whether the sender address is still the correct email address and only the name shows as “USAA Support.”
   • If the email address is correct but the name is wrong, the problem is likely the account display name or a cached/contact entry.
2. Check the Microsoft account alias and account info
   • Go to Edit account info: https://account.live.com/names/manage
   • Review the email aliases on the Microsoft account.
   • Remove any unfamiliar address if present, or add/update the correct address as needed.
   • Microsoft states that aliases share the same account, password, contacts, storage, subscriptions, and settings.
3. If using Outlook for Windows, verify the account settings
   • Open Outlook > File.
   • Under Account Information, select the affected account.
   • Select Account Settings.
   • Check Account Name and Sync Settings and Server Settings.
   • In Server Settings, verify the login information, password, server name, port, and authentication settings.
   • Select Next > Done after correcting anything incorrect.
4. If needed, verify from Mail in Control Panel
   • Open Control Panel > Mail > Email Accounts.
   • Select the affected account > Change.
   • Verify the Incoming mail server, Outgoing mail server, User Name, and Password.
   • Select More Settings > Advanced.
   • Check the IMAP/SMTP port numbers and encryption types.
   • Run Test Account Settings.
   • Red markers mean settings are wrong; green check marks mean the account is configured correctly.
5. If Outlook shows a strange sender identity after account setup
   • There is a known Outlook for Windows issue where a mailbox can appear with an unexpected sender format after adding certain accounts.
   • The documented workaround is to create a new Outlook profile and set the account up manually as IMAP or POP:
     • Close Outlook.
     • Press Windows key + R, run outlook /profiles.
     • Select Options > New.
     • Create a new profile.
     • Choose Advanced options > Let me set up my account manually.
     • Enter the account password and complete setup.
     • If setup fails, use the server details from the email provider and finish the profile setup.
6. If the wrong sender appears in Outlook on the web too
   • That points more to the account identity or alias rather than the Windows app profile.
   • Review the Microsoft account aliases first.
7. If sign-in or account details cannot be changed
   • Use the guided support tool linked from the Microsoft account alias page.
   • Microsoft also provides Contact Support from the account support page for account-change issues.

If the sender address itself has changed to an unfamiliar address, stop sending mail until the account aliases and account settings are reviewed.

References:

• Change the email address for your Microsoft account | Microsoft Support
• Change or update email account settings in Outlook for Windows | Microsoft Support
• Outlook.com email account appears as "outlook_[long series of letters and numbers]@outlook.com" in Outlook for Windows | Microsoft Support