A colleague wrote this extension to the SpamAssassin-VBounce-plugin. If you sign all your mail with DKIM it makes sure that the bounce contains valid DKIM-headers of the original mail. The only problem we experienced is that a few servers don't include any headers of the original mail in the bounce :-(
The patch did not get accepted yet because the CLA-process is not completed/carried on into the sa-bugtracker
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