Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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Exchange Mailbox databases must reside on a dedicated partition.
In the same way that added security layers can provide a cumulative positive effect on security posture, multiple applications can provide a cumulative negative effect. A vulnerability and subseque...Rule Medium Severity -
Exchange Internet-facing Send connectors must specify a Smart Host.
When identifying a "Smart Host" for the email environment, a logical Send connector is the preferred method. A Smart Host acts as an Internet-facing concentrator for other email servers. Appropria...Rule Medium Severity -
Exchange internal Receive connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) Receive connector is used by Exchange to send and receive messages from server to server using SMTP protocol. This setting controls the encryption strength ...Rule Medium Severity -
Exchange Mailboxes must be retained until backups are complete.
Backup and recovery procedures are an important part of overall system availability and integrity. Complete backups reduce the chance of accidental deletion of important information and make it pos...Rule Medium Severity -
Exchange email forwarding must be restricted.
Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Information (CUI) and Personally Identifiable Information (PII) in accordan...Rule Medium Severity -
Exchange email-forwarding SMTP domains must be restricted.
Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Information (CUI) and Personally Identifiable Information (PII) in accordan...Rule Medium Severity -
Exchange Mail quota settings must not restrict receiving mail.
Mail quota settings control the maximum sizes of a user’s mailbox and the system’s response if these limits are exceeded. Mailbox data that is not monitored against a quota increases the risk of ma...Rule Low Severity -
Exchange Mail Quota settings must not restrict receiving mail.
Mail quota settings control the maximum sizes of a user’s mailbox and the system’s response if these limits are exceeded. Mailbox data that is not monitored against a quota increases the risk of ma...Rule Low Severity -
Exchange Mailbox Stores must mount at startup.
Administrator responsibilities include the ability to react to unplanned maintenance tasks or emergency situations that may require Mailbox data manipulation. Occasionally, there may be a need to s...Rule Low Severity -
Exchange Message size restrictions must be controlled on Receive 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
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