Title

Recipients of sent email must be unable to be added to the safe senders list. (Cat II impact)

Discussion

Users could send email messages to request that they be taken off a mailing list. If the email recipient is then automatically added to the Safe Senders List, future e mail messages from that address will no longer be sent to the users Junk email folder, even if it would otherwise be considered junk. By default, recipients of outgoing messages are not added automatically to individual users' Safe Senders Lists. However, users can change this configuration in the Outlook user interface.

Check Content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Junk E-mail "Add e-mail recipients to users' Safe Senders Lists" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\options\mail Criteria: If the value JunkMailTrustOutgoingRecipients is REG_DWORD = 0, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Junk E-mail "Add e-mail recipients to users' Safe Senders Lists" to "Disabled".

Additional Identifiers

Rule ID: SV-53885r1_rule

Vulnerability ID: V-17558

Group Title: DTOO224 - Email Recipient to Safe Sender List

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.