This article was previously published under Q191558
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Mail can not be downloaded or viewed using Microsoft Outlook Express SecurePassword Authentication (SPA) to access messages on an Exchange Servercomputer. You may receive the following error message:
You could not be logged on to the mail server using Secure Password Authentication. Please check your account information and verify that your mail server supports Secure Password Authentication.
This functionality requires that Exchange Server has the Windows NTChallenge/Response enabled for the POP3 protocol.
This problem may occur when a client using SPA tries to log on to a mailboxwhere the mailbox alias is different than the Windows NT account. The mailclient uses the computer's logon credential information for SPA and assumesthat the mailbox alias will be the same as the Windows NT account.
Change the users mailbox alias to match the Windows NT account in theExchange Server Administrator program.
You can test this by telneting to port 110 of the server. After you receivethe server's "ready" response from the Exchange Server computer, type"Auth NTLM," (without the quotation marks) and CRLF. If you get "+ OK,"then the server supports Secure Password Authentication. Otherwise, youwill receive "The NTLM Authentication package has been disabled for thisprotocol."