Exchange filtered messages must be archived.

From Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide

Associated with: CCI-001308

SV-95259r1_rule Exchange filtered messages must be archived.

Vulnerability discussion

By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. This significantly reduces the attack vector for inbound email-borne spam and malware. As messages are filtered, it is prudent to temporarily host them in an archive for evaluation by administrators or users. The archive can be used to recover messages that might have been inappropriately filtered, preventing data loss, and to provide a base of analysis that can provide future filter refinements.

Check content

Open the Exchange Management Shell and enter the following command: Get-ContentFilterConfig | Select Name, QuarantineMailbox If no SMTP address is assigned to "QuarantineMailbox", this is a finding.

Fix text

Open the Exchange Management Shell and enter the following command: Set-ContentFilterConfig -QuarantineMailbox <'QuarantineMailbox SmtpAddress'> Note: The value must be in single quotes.

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