I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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Exch-2-336
Group -
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 -
Exch-2-339
Group -
SMTP IP Allow List Connection 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 -
Exch-2-342
Group -
SMTP IP Allow List entries must be empty.
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 -
Exch-2-705
Group -
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 -
Exch-2-708
Group -
Internet Receive Connector connections count must be set to default.
Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous inbound connections allowed ...Rule Low Severity -
Exch-2-710
Group -
Receive Connector timeout must be limited.
Email system availability depends in part on best practices strategies for setting tuning. This configuration controls the number of idle minutes before the connection is dropped. It works in c...Rule Low Severity -
Exch-2-715
Group -
Internal Receive Connectors must not allow anonymous connections.
This control is used to limit the servers that may use this server as a relay. If a Simple Mail Transport Protocol (SMTP) sender does not have a direct connection to the Internet (for example, an ...Rule Medium Severity -
Exch-2-718
Group -
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 -
Exch-2-721
Group -
External Receive Connectors must be Domain Secure Enabled.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between ...Rule Medium Severity -
Exch-2-724
Group -
Internet facing receive connectors must offer TLS before using basic authentication.
Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. Transport Layer Security (TLS) is designed to protect confidentiality and data integrity ...Rule Medium Severity -
Exch-2-727
Group -
Receive Connectors must control the number of recipients per message.
Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of recipients who will receive a copy of a...Rule Low Severity -
Exch-2-730
Group -
Receive Connectors must control the number of recipients chunked on a single message.
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 -
Exch-2-733
Group -
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 -
Exch-2-736
Group -
Auto-forwarding email to remote domains must be disabled or restricted.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure Aut...Rule Medium Severity -
Exch-2-739
Group -
Tarpitting interval must be set.
Tarpitting is the practice of artificially delaying server responses for specific SMTP communication patterns that indicate high volumes of SPAM or other unwelcome messages. The intent of tarpittin...Rule Medium Severity -
Exch-2-741
Group -
Receive Connector Maximum Hop Count must be 60.
Email system availability depends in part on best practices strategies for setting tuning configurations. This setting controls the maximum number of hops (email servers traversed) a message may ta...Rule Low Severity -
Exch-2-743
Group -
Recipient 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 -
Exch-2-751
Group -
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 -
Exch-2-754
Group -
Send Connectors delivery retries must be controlled.
This setting controls the rate at which delivery attempts from the home domain are retried, user notifications are issued, and notes the expiration time when the message will be discarded. If de...Rule Low Severity -
Exch-2-757
Group -
Message size restrictions must be controlled on Send 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 -
Exch-2-760
Group -
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. I...Rule Low Severity -
Exch-2-763
Group -
Internal Send Connectors must use Domain Security (Mutual Authentication TLS).
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between ...Rule Medium Severity -
Exch-2-766
Group -
Internal Send Connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between ...Rule Medium Severity -
Exch-2-771
Group -
Internet facing send Connectors must specify a Smart Host.
In the case of 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 serve...Rule Medium Severity -
Exch-2-801
Group -
Connectivity logging must be enabled.
A connectivity log is a record of the SMTP connection activity of the outbound message delivery queues to the destination Mailbox server, smart host, or domain. Connectivity logging is available on...Rule Medium Severity
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