Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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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 Medium Severity -
SRG-APP-000247
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SRG-APP-000247
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Exchange send connectors delivery retries must be controlled.
This setting controls the rate at which delivery attempts from the home domain are retried and user notifications are issued and notes the expiration time when the message will be discarded. If d...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 Medium Severity -
SRG-APP-000247
Group -
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 Medium Severity -
SRG-APP-000247
Group -
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 Medium Severity -
SRG-APP-000247
Group -
SRG-APP-000261
Group -
Active hyperlinks in messages from non .mil domains must be rendered unclickable.
Active hyperlinks within an email are susceptible to attacks of malicious software or malware. The hyperlink could lead to a malware infection or redirect the website to another fraudulent website ...Rule Medium Severity -
SRG-APP-000261
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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
Group -
The Exchange sender filter must block unaccepted domains.
Spam origination sites and other sources of suspected email-borne malware have the ability to corrupt, compromise, or otherwise limit availability of email servers. Limiting exposure to unfiltered ...Rule Medium Severity -
SRG-APP-000261
Group
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