make SA remove X-Spam-Flag

[Arvid Ephraim Picciani]

Hi,
just 10 minutes ago i received a false positive. First i was confused then i 
figured that my SA setup didn't actually flag it, but the senders SA.
So, how could i tell SA to remove any X-Spam flags in case the mail has been 
identified as non spam?
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mit freundlichen Grüßen / best regards
Arvid Ephraim Picciani