Exchange Sender Identification Framework must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-80585	EX16-ED-000560	SV-95295r1_rule		Medium

Description
Email is only as secure as the recipient. When the recipient is an email server accepting inbound messages, authenticating the sender enables the receiver to better assess message quality and to validate the sending domain as authentic. One or more authentication techniques used in combination can be effective in reducing spam, phishing, and forger attacks. The Sender ID Framework (SIDF) receiver accesses specially formatted DNS records (SPF format) that contain the IP address of authorized sending servers for the sending domain that can be compared to data in the email message header. Receivers are able to validate the authenticity of the sending domain, helping to avoid receiving inbound messages from phishing or other spam domains.

Description

Email is only as secure as the recipient. When the recipient is an email server accepting inbound messages, authenticating the sender enables the receiver to better assess message quality and to validate the sending domain as authentic. One or more authentication techniques used in combination can be effective in reducing spam, phishing, and forger attacks. The Sender ID Framework (SIDF) receiver accesses specially formatted DNS records (SPF format) that contain the IP address of authorized sending servers for the sending domain that can be compared to data in the email message header. Receivers are able to validate the authenticity of the sending domain, helping to avoid receiving inbound messages from phishing or other spam domains.

STIG	Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide	2018-08-28

Details

Check Text ( C-80317r1_chk )
Open the Exchange Management Shell and enter the following command: Get-SenderIdConfig \| Select Name, Identity, Enabled If the value of "Enabled" is not set to "True", this is a finding.

Fix Text (F-87437r1_fix)
Open the Exchange Management Shell and enter the following command: Set-SenderIdConfig -Enable $true