Cannot Relay Mail Through ISA Server If Authentication Is Required (313318)


The information in this article applies to:

  • Microsoft Internet Security and Acceleration Server 2000
This article was previously published under Q313318

SYMPTOMS

Clients that are outside an ISA server cannot relay mail through that ISA server. This problem may occur if external clients try to send mail to other external recipients.

CAUSE

The internal mail server may require client authentication with the AUTH command. This functionality is not supported by the Simple Mail Transfer Protocol (SMTP) application filter in the original release of Microsoft ISA Server.

RESOLUTION

A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article. Only apply it to systems that are experiencing this specific problem. This fix may receive additional testing to further ensure product quality. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next ISA Server service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
The global version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. 
Date         Time      Version       Size    File name
---------------------------------------------------------
22-Oct-2002  14:25:24  3.0.1200.180  60,176  Fltrsnk1.dll
22-Oct-2002  14:25:28  3.0.1200.180  93,968  Smtpfltr.dll

STATUS

Microsoft has confirmed that this is a problem in Internet Security and Acceleration Server 2000.

Modification Type:MinorLast Reviewed:10/6/2005
Keywords:kbHotfixServer kbQFE kbprb KB313318 kbAudDeveloper
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