Incorrect display of message subjects in mail clients with Kaspersky Security 9.x for Microsoft Exchange Servers installed

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This article refers to:

• Kaspersky Security 9.5 for Microsoft Exchange Servers Maintenance Release 5 (version 9.5.153.0);
• Kaspersky Security 9.4 for Microsoft Exchange Servers Maintenance Release 4 (version 9.4.189.0);
• Kaspersky Security 9.3 for Microsoft Exchange Servers Maintenance Release 3 (version 9.3.54.0);
• Kaspersky Security 9.2 for Microsoft Exchange Servers Maintenance Release 2 (version 9.2.39.0);
• Kaspersky Security 9.1 for Microsoft Exchange Servers Maintenance Release 1 (version 9.1.42.0); 
• Kaspersky Security 9.0 for Microsoft Exchange Servers (version 9.0.129.0).

When a virus or spam is detected in a message passing through a Microsoft Exchange Server Hub Transport role, a special prefix is added to the subject of the email. In some cases, this can corrupt the subject in the email or in the delivery report (any version of Microsoft Exchange Server can be affected):

It is a Microsoft Exchange Server operation issue, not related to Kaspersky Lab products.  

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