Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Exchange local machine policy must require signed scripts.
Scripts, especially those downloaded from untrusted locations, often provide a way for attackers to infiltrate a system. By setting machine policy to prevent unauthorized script executions, unantic...Rule Medium Severity -
SRG-APP-000213
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SRG-APP-000219
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Exchange internal Send connectors must use domain security (mutual authentication Transport Layer Security).
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. Several controls work together to provide security between internal server...Rule Medium Severity -
SRG-APP-000219
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SRG-APP-000247
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Exchange Outbound Connection Timeout must be 10 minutes or less.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the number of idle minutes before the connection is dropped. It ...Rule Medium Severity -
SRG-APP-000247
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Exchange Outbound Connection Limit per Domain Count must be controlled.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous outbound connections from a d...Rule Medium Severity -
SRG-APP-000247
Group -
Exchange Send connector connections count must be limited.
This setting controls the maximum number of simultaneous outbound connections allowed for a given SMTP Connector and can be used to throttle the SMTP service if resource constraints warrant it. If ...Rule Low Severity -
SRG-APP-000247
Group -
Exchange message size restrictions must be controlled on Send connectors.
Email system availability depends in part on best practice strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound ...Rule Low Severity -
SRG-APP-000247
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SRG-APP-000247
Group -
Exchange Send connectors must be clearly named.
For Send connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be made ...Rule Low Severity -
SRG-APP-000247
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Exchange Receive connector Maximum Hop Count must be 60.
Email system availability depends in part on best practice strategies for setting tuning configurations. This setting controls the maximum number of hops (email servers traversed) a message may tak...Rule Medium Severity -
SRG-APP-000247
Group -
Exchange Receive connectors must be clearly named.
For receive connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be ma...Rule Low Severity
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