Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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Exchange Receive connectors must control the number of recipients per message.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of recipients who will receive a copy of a ...Rule Low Severity -
The 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 Low Severity -
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 -
The Exchange global outbound message size must be controlled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Message size limits should be set to 10 megabytes (MB) at most but often are smaller, depend...Rule Low Severity -
The 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 Low Severity -
Exchange external/Internet-bound automated response messages must be disabled.
Spam originators, in an effort to refine mailing lists, sometimes monitor transmissions for automated bounce-back messages. Automated messages include such items as "Out of Office" responses, nonde...Rule Medium Severity -
Exchange servers must have an approved DoD email-aware virus protection software installed.
With the proliferation of trojans, viruses, and spam attaching themselves to email messages (or attachments), it is necessary to have capable email-aware anti-virus (AV) products to scan messages a...Rule High Severity -
The Exchange Global Recipient Count Limit must be set.
Email system availability depends in part on best practice strategies for setting tuning configurations. The Global Recipient Count Limit field is used to control the maximum number of recipients t...Rule Low Severity -
An Exchange software baseline copy must exist.
Exchange software, as with other application software installed on a host system, must be included in a system baseline record and periodically reviewed; otherwise, unauthorized changes to the soft...Rule Medium Severity -
Exchange software must be monitored for unauthorized changes.
Monitoring software files for changes against a baseline on a regular basis may help detect the possible introduction of malicious code on a system.Rule Medium Severity
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