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Q134371: SMTP: Loss of Available Free Memory During Operation

Article: Q134371
Product(s): Microsoft Mail For PC Networks
Version(s): MS-DOS:3.0
Operating System(s): 
Keyword(s): 
Last Modified: 23-JAN-2000

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The information in this article applies to:

- Microsoft Mail Gateway to SMTP, version 3.0 
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SYMPTOMS
========

During operation of the SMTP gateway, the available memory can unexpectedly
decrease, and eventually it will interfere with the ability of the gateway to
process mail.

CAUSE
=====

Memory loss can occur if an incoming message contains two subject lines. Memory
allocated for the first subject is not released after processing the message.

If you stop and restart the gateway, it will restore the free memory pool. The
-BR option can be used to stop the gateway after a designated period of time.

For additional information, please see the following article in the Microsoft
Knowledge Base:

  Q96126 SMTP: Error in Documentation for -BR Parameter

NOTE: You can restart the gateway through a batch file that calls itself.

STATUS
======

Microsoft has confirmed this to be a problem in version 3.0.9 of the Microsoft
Mail Gateway to SMTP. A fix for this problem is in development, but has not been
regression-tested and may be destabilizing in production environments. Contact
Microsoft Product Support Services for more information on the availability of
this fix.


MORE INFORMATION
================

Ordinarily a message will have only one subject, and when the second subject
occurs, the memory allocated for the first subject is not released. The memory
allocated for the subject is generally less than 40 bytes, but the position of
the memory can fragment the free memory pool and result in failures when it
attempts to allocate additional memory.

For additional information on how to observe the free memory during the gateway
operation, please see the following article in the Microsoft Knowledge Base:

  Q108374 SMTP: How to Find Available Memory

Additional query words: 3.00.9 QFE483 heap header

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Keywords          :  
Technology        : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGateSMTP300
Version           : MS-DOS:3.0

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