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Exchange Receive connectors must control the number of recipients chunked on a single message.


Overview

Finding ID Version Rule ID IA Controls Severity
V-80537 EX16-ED-000290 SV-95247r1_rule Low
Description
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.
STIG Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide 2019-03-12

Details

Check Text ( C-80269r1_chk )
Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select Name, Identity, ChunkingEnabled

For each receive connector, if the value of "ChunkingEnabled" is not set to "True", this is a finding.
Fix Text (F-87389r1_fix)
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.