Recipients of sent email must be unable to be added to the safe sender's list.

From Microsoft Outlook 2010

Part of DTOO224 - Email Recipient to Safe Sender List

SV-33520r1_rule Recipients of sent email must be unable to be added to the safe sender's list.

Vulnerability discussion

Users could send e-mail messages to request that they be taken off a mailing list. If the e-mail 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 E-mail 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.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Preferences -> Junk E-mail “Add e-mail recipients to users' Safe Senders Lists” to “Disabled”.

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