Details

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.

Solution

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.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Exchange_2013_Y21M01_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-207306r615936_rule
• STIG-ID|EX13-MB-000200
• STIG-Legacy|SV-84641
• STIG-Legacy|V-70019
• Vuln-ID|V-207306

Source

• Tenable.com/audits