Microsoft Exchange Server
TMA-EXCHANGE-1.3
Ensure 'Sender reputation' is configured
Description
Sender reputation filters all messages from all receive connectors on that system and only messages from external sources are filtered. External sources are defined as non- authenticated sources, which are considered anonymous internet sources. This recommendation configures several parameters: • Enabled parameter enables or disables sender reputation on the Exchange server. •... Prints compliant when SenderBlockingEnabled and OpenProxyDetectionEnabled are True and SrlBlockThreshold is 6. Run on each Edge Transport server. Run from an Exchange Management Shell or after `Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn`; the audit loads the snap-in itself when Get-ExchangeServer is missing and fails if it cannot.
How it is checked
Audit method: Shell command
$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ExchangeServer -ErrorAction SilentlyContinue)) { Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn -ErrorAction Stop }; if (-not (Get-Command Get-ExchangeServer -ErrorAction SilentlyContinue)) { throw 'Exchange Management Shell cmdlets are not available' }; $c = Get-SenderReputationConfig -ErrorAction Stop; if ($c.SenderBlockingEnabled -eq $true -and $c.OpenProxyDetectionEnabled -eq $true -and [int]$c.SrlBlockThreshold -eq 6) { 'compliant' } else { 'noncompliant' }- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Set-SenderReputationConfig -Enabled $true -SenderBlockingEnabled $true -OpenProxyDetectionEnabled $true -SrlBlockThreshold 6
Properties
- Operating systems
- Any
- Tags
- exchangeantispam
- Reference
- CIS Microsoft Exchange Server 2019 Benchmark v1.0.1 - 1.3 Ensure 'Sender reputation' is configured
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target exchange