Size of SMTP messages may increase during the scanning process in Antigen

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In Microsoft Antigen, when you configure an SMTP Scan Job to perform Spam Scanning, Content Filtering, or Keyword Filtering, the size of the incoming SMTP messages may increase during the scanning process. This could result in increased hard disk usage when the messages are delivered to the Exchange Information Store or when Antigen archives the messages.
To resolve this problem in Antigen 8.0, install the updated Mimenavigator.dll file. To obtain this update, contact Microsoft Customer Support Services (CSS). For information about how to contact CSS, visit the following Microsoft Web site: After you receive the update, apply it to the computer that is running Antigen. To do this, follow these steps:
  1. Exit the Antigen administrative console.
  2. Stop all Antigen and Exchange services.
  3. In Windows Explorer, locate and open the following folder:
    %Program Files%\Sybari Software\Antigen for Exchange
  4. In the right pane, right-click MIMENavigator.dll, and then click Rename.
  5. Type MIMENavigator.sr3, and then press ENTER.
  6. Copy the downloaded MimeNavigator.dll file to the current folder.
  7. Restart Antigen and Exchange services.
To resolve this problem in Antigen 9.0, install the hotfix that is described in the "Hotfix information" section.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


There are no prerequisites for installing this hotfix.

Restart requirement

The hotfix will automatically stop and restart any required services. You may have to restart the computer to complete the hotfix installation if the following conditions are true:
  • The required service cannot be stopped.
  • The files are in an open state.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 928082 - Last Review: 01/15/2015 01:31:22 - Revision: 6.0

Microsoft Antigen 9.0 for Exchange, Microsoft Antigen for SMTP Gateways, Sybari Antigen 8.0 for Microsoft Exchange, Sybari Antigen 8.0 for SMTP Gateways

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