XFOR: POP3 or IMAP4 Client Cannot Send SMTP Mail: Event 4183

ID: Q200788

The information in this article applies to:

SUMMARY

If you use incorrect logon credentials on a POP3 or IMAP4 client (connecting to a Microsoft Exchange Server Internet Mail Service to send outgoing SMTP mail) that is configured to enter authentication credentials for the outgoing mail server, the following event appears in the Exchange Server computer's application event log:

Event ID: 4183
Source: MSExchange IMC
Type: Error
Category: SMTP Interface Events

Authentication attempt (AUTH LOGIN) from hostname as ntdomain\userid failed: LogonUser() call failed with error: Logon failure: unknown user name or bad password.


MORE INFORMATION

When you enter the logon credentials at the client, use the correct username and password, or configure the client so that the outgoing mail server does not require authentication. See the section below.

If the Exchange Server computer's Internet Mail Service is not configured to require authentication from the hosts (or clients) that connect to it, then the client does not need to be configured to require authentication.

To determine if the Internet Mail Service requires authentication:

  1. In the Exchange Server Administrator program, open the property pages for the Internet Mail Service object.


  2. Click the Connections tab.


  3. In the Accept Connections area, if the From any host (secure or non-secure) option is selected, the client does not need to be configured to require authentication on the outgoing mail server.


  4. In the Accept Connections area, if the Only from hosts using Authentication option is selected, the client does need to be configured to require authentication on the outgoing mail server.


To determine if an Outlook Express client is configured to require authentication when connecting to an outgoing mail server, follow the steps below. For other clients, refer to that client's documentation.
  1. In Outlook Express, on the Tools menu, click Accounts.


  2. Select the mail account, and then click Properties.


  3. Click the Servers tab, and find the Outgoing Mail Server area.


  4. If the Exchange Server Internet Mail Service requires authentication, click to select the My server requires authentication check box, and then click Settings to enter the logon information.


  5. If the Exchange Server Internet Mail Service does not require authentication, do not select My server requires authentication.


Additional query words: xcln, netscape, oe, auth login 


Keywords          : exc5 exc55 
Version           : winnt:5.0,5.5
Platform          : winnt 
Issue type        : kbhowto

Last Reviewed: August 12, 1999