XCLN: Error 505 Authentication Required in Outlook Express

ID: Q199164

The information in this article applies to:

SYMPTOMS

When you use Outlook Express to send messages by means of Exchange Server 5.5, you may receive the following error message:

An unknown error was returned from the SMTP server. Subject Subject, Account 'Sender', Server: servername, Protocol: SMTP, Server Response: '505 Authentication required', Port: 25, Secure(SSL): No, Server Error: 505, Error Number: 0x800CCC61.
POP3 and IMAP clients in Outlook Express may receive the same error message.


CAUSE

The Exchange Server Internet Mail Service is configured to allow connections using authentication, and the Outlook client has not been configured to send authentication credentials.


RESOLUTION

Configure the Outlook client to send authentication credentials as follows:

  1. Click Tools on main tool bar.


  2. Click Accounts.


  3. Select the current user account.


  4. Click Properties.


  5. Select the Servers tab.


  6. In the Outgoing Mail Server option, click to enable the My server requires authentication check box.


  7. Click Settings.


  8. In the Logon Information dialog box, select one of the three options:


    9. Use same setting as my Incoming Mail server: The authentication credentials found in the Incoming Mail Server option.

    Log on using: Enter the user account and password of the current user.

    Log on using Secure Password Authentication: An authentication credential will be displayed every time a message is sent.
  9. Click OK until the Internet dialog box appears, and click Close.


  10. Compose a new message and send it.



MORE INFORMATION

Exchange Server 5.5 provides the option to allow connections to the Internet Mail Service using credentials. The option can be set in the Internet Mail Service Properties, on the Connections tab, by clicking the Accept Connections options. Selecting "Only from hosts using Authentication" and "Clients can only submit if homed on this server," requires any POP3 or IMAP client to be verified prior to allowing connections.

Additional query words: 


Keywords          : exc55 
Version           : winnt:5.5
Platform          : winnt 
Issue type        : kbprb

Last Reviewed: June 4, 1999