MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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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
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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 at most but often are smaller, depending o...Rule Low Severity -
SRG-APP-000247
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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
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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
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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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SRG-APP-000247
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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 -
SRG-APP-000247
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Exchange Receive connectors must control the number of recipients chunked on a single message.
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
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The Exchange Internet Receive connector connections count must be set to default.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous inbound connections allowed t...Rule Low Severity -
SRG-APP-000247
Group -
Exchange Message size restrictions must be controlled on Receive connectors.
Email system availability depends in part on best practices strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound...Rule Low Severity -
SRG-APP-000261
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Exchange messages with a blank sender field must be rejected.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
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Exchange messages with a blank sender field must be filtered.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
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SRG-APP-000261
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Exchange nonexistent recipients must not be blocked.
Spam originators, in an effort to refine mailing lists, sometimes use a technique where they first create fictitious names and then monitor rejected emails for non-existent recipients. Those not re...Rule Medium Severity -
SRG-APP-000261
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The Exchange Sender Reputation filter must be enabled.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
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The Exchange Sender Reputation filter must identify the spam block level.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
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SRG-APP-000261
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SRG-APP-000261
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The Exchange Block List service provider must be identified.
Block List filtering is a sanitization process performed on email messages prior to their arrival at the destination mailbox. By performing this process at the email perimeter, threats can be elimi...Rule Medium Severity -
SRG-APP-000261
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Exchange messages with malformed From address must be rejected.
Sender Identification (SID) is an email antispam sanitization process. Sender ID uses DNS MX record lookups to verify the Simple Mail Transfer Protocol (SMTP) sending server is authorized to send e...Rule Medium Severity -
SRG-APP-000261
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The Exchange Recipient filter must be enabled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
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The Exchange tarpitting interval must be set.
Tarpitting is the practice of artificially delaying server responses for specific Simple Mail Transfer Protocol (SMTP) communication patterns that indicate high volumes of spam or other unwelcome m...Rule Medium Severity -
SRG-APP-000261
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SRG-APP-000261
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Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List entries must be empty.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
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The Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List Connection filter must be enabled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
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The Exchange Simple Mail Transfer Protocol (SMTP) Sender filter must be enabled.
Email system availability depends in part on best practices strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availa...Rule Medium Severity -
SRG-APP-000261
Group
Node 2
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