Methods used

The following three methods are used to scan emails:

Mailbox database protection - Formerly known as Mailbox scanning via VSAPI. This type of protection is only available for Microsoft Exchange Server 2010, 2007 and 2003 operating in the Mailbox Server (Microsoft Exchange 2010 and 2007) or Back-End server (Microsoft Exchange 2003) role. This type of scanning can be performed on a single server installation with multiple Exchange Server roles on one computer (as long as it includes the Mailbox or Back-End role).

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Mailbox database protection is not available for Microsoft Exchange Server 2013, 2016 and 2019.

Mail transport protection - Formerly known as Message filtering on the SMTP server level. This protection is provided by the transport agent and is only available for Microsoft Exchange Server 2003 or newer operating in the Edge Transport Server or Hub Transport Server role. This type of scanning can be performed on a single server installation with multiple Exchange Server roles on one computer (as long as it has one of mentioned server roles).

On-demand mailbox database scan - Allows you to execute or schedule an Exchange mailbox database scan. This feature is only available for Microsoft Exchange Server 2007 or newer operating in the Mailbox server or Hub Transport role. This also applies to a single server installation with multiple Exchange Server roles on one computer (as long as it has one of mentioned server roles).

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For comprehensive view, see matrix of ESET Mail Security features and Microsoft Exchange Server versions and their roles.