The Exchange Internet Message Access Protocol 4 (IMAP4) service must be disabled.

IMAP4 is not approved for use within the DOD. It uses a clear-text-based user name and password and does not support the DOD standard for PKI for email access. User name and password could easily be captured from the network, allowing a malicious user to access other system features. Uninstalling or disabling the service will prevent the use of the IMAP4 protocol.

Note: This requirement applies to IMAP4. IMAP Secure is not restricted and does not apply to this requirement.

Open the Windows PowerShell and enter the following command:

Get-Service -Name MSExchangeIMAPBE,MSExchangeImap4 |Select-Object -Property Name,StartType

If ANY of the IMAP services StartType is NOT set to "Disabled", this is a finding.

Open the Windows PowerShell in an Elevated Prompt and enter the following commands:

Get-Service -Name MSExchangeIMAPBE,MSExchangeImap4 |ForEach-Object {Set-Service -Name $_.Name -StartupType Disabled}