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This SpamAssassin plugin module allows users to specify, through a user preferences database, a value that will be added to the message header, for all messages, specifying what value/score it is safe to delete the message. Obviously, you need some other process that looks at this header and performs the action, since SpamAssassin only filters and does not delete.
Code
Add the following to your local.cf file:
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Add the above configuration to your local.cf file and watch for the custom delete header to start showing up in your mail messages.CategorySoftware