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If you want to add custom headers in the rewritten mail message, the Mail::SpamAssassin::PerMsgStatus::set_tag() API is the way to do it.

The way it works is, you add a line like this to the plugin configuration file, or the user's preferences file:

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You can also get the value of a tag using the Mail::SpamAssassin::PerMsgStatus::get_tag() API from inside a plugin, although note that some of the tags will not be filled in until after the scan completes, and may not be available.