ReadMe for

MAILsweeper for SMTP 4.3.20

This is the ReadMe for the MAILsweeper for SMTP 4.3.20 patch. It describes the problems the patch resolves, the prerequisites for installation, and how to install and remove the patch. It also lists the files included in the patch. Note that this patch can also be installed on MIMEsweeper for Exchange.

Contents

This ReadMe contains the following topics:

• Patch description
• Prerequisites
• Installing the patch
• Removing the patch
• Files included in this patch

Patch description

The MAILsweeper for SMTP Version 4.3.20 patch provides solutions to the following problems.

• It was possible for a message to bypass text analysis if the message specified a non-existent character set. If the specified character set is invalid, MAILsweeper for SMTP now tries to detect which character set is used in the message.
• If a reverse DNS lookup resulted in the Received header in a message including non-ASCII characters, the Receiver service would stop processing messages. This problem has now been corrected.
• In some circumstances the Delivery service could treat any 4nn response to a DATA command as a permanent error. The Delivery service now treats any 4nn failure as a temporary error, and tries again later.
• If the attribute pair in the Content-Type header of a message broke across a line, it resulted in an error indicating that MAILsweeper for SMTP had a problem reassembling a message after analysis and modification. This problem has now been corrected.
• When a message used ISO-2022 encoding, MAILsweeper for SMTP could cause the message to display spurious characters in the Subject line when you used the Inform action. This problem has now been corrected.
• In some very rare circumstances it was possible for a malformed message that should have been classified as Undetermined to cause unpredictable behavior. In particular, it could cause the Security service to stop processing messages. This problem has now been corrected.
• The Receiver service slowed down in response to connection attempts made after the maximum number of concurrent connections was reached. (Maximum concurrent connections is a Receiver service property in the Policy Editor.) Connection attempts made after the maximum is reached are no longer subject to unnecessary DNS and RBL checks, which avoids the increased load previously caused by such attempts.

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Prerequisites

You must only install this patch on the following version of MAILsweeper for SMTP:

• MAILsweeper for SMTP 4.3.19

or on the following version of MIMEsweeper for Exchange:

• MIMEsweeper for Exchange 4.3.19

You must log on with the Administrator account that originally installed MAILsweeper for SMTP or MIMEsweeper for Exchange.

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Installing the patch

Before installing this patch, ensure that you have read the Prerequisites section of this ReadMe.

To install the MAILsweeper for SMTP 4.3.20 patch:

1. Stop the MAILsweeper for SMTP services and close the MAILsweeper for SMTP Console.
2. Disable all anti-virus tools on the machine.
3. Close the Windows Event Viewer if it is open.
4. Close down REMOTEmanager, if it is installed.
5. If you are using MAILsweeper's Personal Message Manager (PMM) software:
   • Close the PMM Administration interface.
   • Stop the IIS Admin Service (which will also shut down the WWW Publishing Service).
6. Run MSW4320.exe from your patch installation media.
7. Re-enable the anti-virus tools you disabled in step 2.
8. Open the MAILsweeper for SMTP Console and restart the MAILsweeper for SMTP services.

If the installer experiences problems, it will roll back to the version that was installed on your machine before you installed this patch. If you experience any other problems, please contact your normal support provider.

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Removing the patch

If you experience problems after installing MAILsweeper for SMTP 4.3.20, you can remove the patch. No messages can be processed during the removal of the patch.

To remove the MAILsweeper for SMTP 4.3.20 patch:

1. Stop the MAILsweeper for SMTP services and close the MAILsweeper for SMTP Console.
2. Disable all anti-virus tools on the machine.
3. Close the Windows Event Viewer if it is open.
4. Close down REMOTEmanager, if it is installed.
5. If you are using MAILsweeper's Personal Message Manager (PMM) software:
   • Close the PMM Administration interface.
   • Stop the IIS Admin Service (which will also shut down the WWW Publishing Service).
6. Navigate to the MAILsweeper for SMTP program folder, by default C:\Program Files\MAILsweeper for SMTP\Program.
   (On MIMEsweeper for Exchange systems this is C:\Program Files\MIMEsweeper for Exchange\Program.)
7. Select the folder MAILsweeper for SMTP v4.3_20, and then run rollback.exe.
8. Re-enable the anti-virus tools you disabled in step 2.
9. Open the MAILsweeper for SMTP Console and restart the MAILsweeper for SMTP services.

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Files included in this patch

The table below shows the MAILsweeper for SMTP program files updated for this patch, and lists their current version number for this patch.

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Revision 1.0 May 2006
Published by Clearswift Ltd.
© 1995-2006 Clearswift Ltd.
All rights reserved

The materials contained herein are the sole property of Clearswift Ltd. No part of this publication may be reproduced or disseminated or transmitted in any form or by any means electronic, mechanical, photocopying, recording, or otherwise stored in any retrievable system or otherwise used in any manner whatsoever, in part or in whole, without the express permission of Clearswift Ltd.

Information in this document may contain references to fictional persons, companies, products and events for illustrative purposes. Any similarities to real persons, companies, products and events are coincidental and Clearswift shall not be liable for any loss suffered as a result of such similarities.

The Clearswift Logo and Clearswift product names including MIMEsweeper^TM, MAILsweeper^TM, e-Sweeper^TM, IMAGEmanager^TM, REMOTEmanager^TM, SECRETsweeper^TM, ENTERPRISEsuite^TM, ClearPoint^TM, ClearSecure^TM, ClearEdge^TM, ClearBase^TM, ClearSurf^TM, DeepSecure^TM, Bastion^TM II, X.400 Filter^TM, FlashPoint^TM, ClearDetect^TM, ClearSupport^TM, ClearLearning^TM, SpamLogic^TM are trademarks or registered trademarks of Clearswift Ltd. All other trademarks are the property of their respective owners. Clearswift Ltd. (registered number 3367495) is registered in Britain with registered offices at 1310 Waterside, Arlington Business Park, Theale, Reading, Berkshire RG7 4SA, England. Users should ensure that they comply with all national legislation regarding the export, import, and use of cryptography.

Clearswift reserves the right to change any part of this document at any time.

U.S. Patent No. 5,623,600

Protected by UK Patent 2,366,706