Details

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 message size. Failure to control the configuration strategy can result in loss of data or system availability.

This setting enables the administrator to enable ‘chunking’ on received messages as they arrive at the domain. This is done so large message bodies can be relayed by the remote sender to the Receive connector in multiple, smaller chunks.

Solution

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -ChunkingEnabled $true

Note: The value must be in single quotes.

Repeat the procedure for each receive connector.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Exchange_2016_Y21M07_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Windows.

References

• 800-53|SC-5(2)
• CAT|III
• CCI|CCI-001095
• Rule-ID|SV-221228r612603_rule
• STIG-ID|EX16-ED-000290
• STIG-Legacy|SV-95247
• STIG-Legacy|V-80537
• Vuln-ID|V-221228

Source

• Tenable.com/audits