Exchange Send connectors delivery retries must be controlled.

From MS Exchange 2013 Mailbox Server Security Technical Implementation Guide

Associated with: CCI-001095

SV-84641r1_rule Exchange Send connectors delivery retries must be controlled.

Vulnerability discussion

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 delivery retry attempts are too frequent, servers will generate network congestion. If too far apart, messages may remain queued longer than necessary, potentially raising disk resource requirements.The default values of these fields should be adequate for most environments. Administrators may wish to modify the values as a result, but changes should be documented in the System Security Plan.Note: Transport configuration settings apply to the organization/global level of the Exchange SMTP path. By checking and setting them at the Hub server the setting will apply to both Hub and Edge roles.

Check content

Review the Email Domain Security Plan (EDSP). Determine the value for Transient Failure Retry Count. Open the Exchange Management Shell and enter the following command: Get-TransportService | Select Name, Identity, TransientFailureRetryCount If the value of TransientFailureRetryCount is not set to 10 or less, this is a finding. or If the value of TransientFailureRetryCount is set to more than 10 or has signoff and risk acceptance in the EDSP, this is not a finding.

Fix text

Update the EDSP. Open the Exchange Management Shell and enter the following command: Set-TransportService -Identity <'IdentityName'> -TransientFailureRetryCount 10 Note: The value must be in quotes. or The value as identified by the EDSP that has obtained a signoff with risk acceptance.

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