Add-Edit: To
To filter mail on the basis of the intended recipient, enter a single email address (format: user@domain.com) in the To: field of the Add/Edit Rule page.
Addresses entered here are compared against the To: line in the message header. When combined with Outbound scanning, the To: field can be used to screen mail that is being sent to particular sites or persons. When combined with Inbound filtering, for example, the To: field can be used to screen mail intended for an individual who is the target of a spam-mail campaign, or who is receiving harassing mail.
See also:
Adding or Editing Spam Filter Rules
Current Rules
Setting up rules—strategy
Creating A Keyword List: Example