Article: Q251149
Product(s): Microsoft Exchange
Version(s): winnt:5.5
Operating System(s):
Keyword(s): exc55
Last Modified: 11-MAR-2000
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The information in this article applies to:
- Microsoft Exchange Server, version 5.5
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SYMPTOMS
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The Internet Mail Service may allow non-authenticated users to relay mail if the
Microsoft Windows NT domain Guest account is enabled.
CAUSE
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This problem can occur if non-authenticated users bypass routing restrictions
that require authentication by using the Guest account. After Simple Mail
Transfer Protocol (SMTP) authentication does not work, some clients use the
Guest account.
WORKAROUND
==========
To work around this problem, disable the Guest account:
1. In Windows NT User Manager for Domains, double-click the Guest account to
select it.
2. Click to select the "Account Disabled" check box, and then click OK to save
the changes.
Additional query words: IMS IMC relay netscape
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Keywords : exc55
Technology : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version : winnt:5.5
Issue type : kbprb
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